US BUYER’S GUIDE · 6 PRODUCTS

Business phone systems

Which phone system fits US calling, routing, teamwork, and administration?

Compare US business calling, shared numbers, routing, integrations and AI assistance without confusing a seat subscription with the entire phone bill.

Research desk · Oct 20, 2026 · Methodology

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Highest documented score first. Fit adds up the 28 feature checks below, including AI, across documented plans. Entry price does not include every capability. Unknown evidence appears as a range.

Product / good fit for	Pricing context	Documented fit	Next step
Zoom Phone Companies already using Zoom that want phone service integrated with their collaboration workflow.	See pricingper user per monthUS & Canada metered / unlimited	79–100/100 documented fit 79% evidence coverage	Full research →
Dialpad Connect Teams that want call intelligence and everyday business communications in the same app.	Custom quoteper user per monthConnect	70–100/100 documented fit 70% evidence coverage	Full research →
Quo (formerly OpenPhone) Small US/Canada-facing teams organizing customer calls and messages around shared numbers.	$15.00per user per month · billed annuallyStarter	70–100/100 documented fit 70% evidence coverage	Full research →
RingCentral RingEX Organizations consolidating calling and collaboration across locations and existing business applications.	See pricingper monthRingEX	70–100/100 documented fit 70% evidence coverage	Full research →
Zadarma Zadarma Small international teams needing local numbers and CRM-linked calling.	See pricingteam plus numbers/usageStandard / Office	57–100/100 documented fit 57% evidence coverage	Full research →
Nextiva US small and midsize companies bringing phone, team messages and customer conversations together.	See pricingper user per monthCore / Engage / Scale	52–100/100 documented fit 52% evidence coverage	Full research →

BEYOND A FEATURE CHECKMARK

How deep does the capability go?

Choose up to 3 for a closer look →

28 weighted checks: core capabilities contribute 32 points and workflow depth contributes 68. AI is included at the weight shown for this category. Expand Evidence for scope and sources, or ask for the same demonstration from each supplier.

Show checksShowing fewer rows does not change the score.

Business phone systems features for all 6 products
Feature / base weight	Zoom Phone 79–100/100 documented fit Core capabilities32 / 32 pts10/10 checks with established status Workflow depth46.9–68 / 68 pts12/18 checks with established status	Dialpad Connect 70–100/100 documented fit Core capabilities28.8–32 / 32 pts9/10 checks with established status Workflow depth40.8–68 / 68 pts8/18 checks with established status	Quo (formerly OpenPhone) 70–100/100 documented fit Core capabilities32 / 32 pts10/10 checks with established status Workflow depth38.4–68 / 68 pts8/18 checks with established status	RingCentral RingEX 70–100/100 documented fit Core capabilities32 / 32 pts10/10 checks with established status Workflow depth37.6–68 / 68 pts8/18 checks with established status	Zadarma 57–100/100 documented fit Core capabilities25.6–32 / 32 pts8/10 checks with established status Workflow depth31.2–68 / 68 pts6/18 checks with established status	Nextiva 52–100/100 documented fit Core capabilities29.6–32 / 32 pts9/10 checks with established status Workflow depth22.4–68 / 68 pts4/18 checks with established status
Core capabilityUS numbers or number porting4 points · Obtain a US business number or transfer an existing number.	Supported4 / 4 pts Evidence US Phone plans and eligible AI Companion features. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Connect calling, apps, messages, transcripts and action recaps. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Phone/app capabilities; advanced calling and AI require eligible tier. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence RingEX capability; AI and integration access depend on tier. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence US numbers with verification. Official documentation · Oct 20, 2026Source	Supported4 / 4 pts Evidence US calling, apps and business call routing. Official documentation · Oct 15, 2026Source
Core capabilityUS business calling4 points · Make and receive business calls under a documented US plan.	Supported4 / 4 pts Evidence US Phone plans and eligible AI Companion features. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Connect calling, apps, messages, transcripts and action recaps. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Phone/app capabilities; advanced calling and AI require eligible tier. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence RingEX capability; AI and integration access depend on tier. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence US number calling; separate usage tariff. Official documentation · Oct 20, 2026Source	Supported4 / 4 pts Evidence US calling, apps and business call routing. Official documentation · Oct 15, 2026Source
Depth checkCall-quality or failure diagnostics5.6 points · Inspect call quality or technical failure information for a specific business call. Ask for a demonstration Open a problematic call and show the recorded quality or failure information. A scenario to run with the supplier; not a completed product test.	Supported5.6 / 5.6 pts Evidence QoS dashboard supports extension-level and individual call investigation. Official documentation · Oct 15, 2026Source	Supported5.6 / 5.6 pts Evidence Call Review exposes per-call jitter, packet loss, bitrate and latency. Official documentation · Oct 15, 2026Source	Not verified0–5.6 / 5.6 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source	Supported5.6 / 5.6 pts Evidence QoS analytics supports call/session quality diagnostics. Official documentation · Oct 15, 2026Source	Supported5.6 / 5.6 pts Evidence End webhook exposes Q.931 failure status. Official documentation · Oct 20, 2026Source	Supported5.6 / 5.6 pts Evidence Voice Analytics includes individual-call quality investigation. Official documentation · Oct 15, 2026Source
Depth checkNumber continuity and forwarding6.4 points · Forward or reroute an existing business number while changing its device, user, or destination. Ask for a demonstration Move or forward a business line and demonstrate where incoming calls now arrive. A scenario to run with the supplier; not a completed product test.	Supported6.4 / 6.4 pts Evidence Call handling supports destination changes and holiday-specific routes. Official documentation · Oct 15, 2026Source	Supported6.4 / 6.4 pts Evidence Main-line routing supports wait limits and fallback destinations. Official documentation · Oct 15, 2026Source	Supported6.4 / 6.4 pts Evidence Call flows combine forwarding, warm transfers and backup routes for unanswered calls. Official documentation · Oct 15, 2026Source	Supported6.4 / 6.4 pts Evidence RingEX supports call forwarding and custom holiday hours. Official documentation · Oct 15, 2026Source	Supported6.4 / 6.4 pts Evidence Conditional/unconditional forwarding. Official documentation · Oct 20, 2026Source	Supported6.4 / 6.4 pts Evidence Call forwarding supports alternative numbers and extensions. Official documentation · Oct 15, 2026Source
Core capabilityDesktop and mobile calling4 points · Use business calling through desktop and mobile applications.	Supported4 / 4 pts Evidence Apps, Team SMS, routing, connectors and Phone API. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Connect calling, apps, messages, transcripts and action recaps. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Phone/app capabilities; advanced calling and AI require eligible tier. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Apps, auto-attendant and call handling. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Desktop and mobile apps. Official documentation · Oct 20, 2026Source	Supported4 / 4 pts Evidence US calling, apps and business call routing. Official documentation · Oct 15, 2026Source
Core capabilityTeam or shared business messaging4 points · Use internal team messaging or shared customer messaging.	Supported4 / 4 pts Evidence Apps, Team SMS, routing, connectors and Phone API. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Connect calling, apps, messages, transcripts and action recaps. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Phone/app capabilities; advanced calling and AI require eligible tier. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence RingEX capability; AI and integration access depend on tier. Official documentation · Oct 15, 2026Source	Not verified0–4 / 4 pts Evidence Not established in the reviewed documentation. Not verified · Oct 20, 2026Source	Supported4 / 4 pts Evidence US calling, apps and business call routing. Official documentation · Oct 15, 2026Source
Depth checkLive-call team handoff5.6 points · Transfer an active call to a colleague or shared destination without asking the caller to redial. Ask for a demonstration Answer a test call and transfer it to another team member. A scenario to run with the supplier; not a completed product test.	Supported5.6 / 5.6 pts Evidence Administrative policies control overflow and live call transfer. Official documentation · Oct 15, 2026Source	Supported5.6 / 5.6 pts Evidence Direct and warm transfers route calls to colleagues or destinations. Official documentation · Oct 15, 2026Source	Supported5.6 / 5.6 pts Evidence Call flows combine forwarding, warm transfers and backup routes for unanswered calls. Official documentation · Oct 15, 2026Source	Not verified0–5.6 / 5.6 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source	Supported5.6 / 5.6 pts Evidence Live-call transfer and pickup. Official documentation · Oct 20, 2026Source	Supported5.6 / 5.6 pts Evidence NextivaONE supports active-call transfer. Official documentation · Oct 15, 2026Source
Depth checkShared customer conversation context6.4 points · Let team members access a shared business conversation or call history with notes or context. Ask for a demonstration Show a second team member the earlier customer interaction and its saved context. A scenario to run with the supplier; not a completed product test.	Not verified0–6.4 / 6.4 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source	Supported6.4 / 6.4 pts Evidence Authorized executive assistants can view shared call history, transcripts and summaries. Official documentation · Oct 15, 2026Source	Supported6.4 / 6.4 pts Evidence Per-number AI controls, shared call history and MCP transcript analysis are documented. Official documentation · Oct 15, 2026Source	Supported6.4 / 6.4 pts Evidence Salesforce integration logs call activity against shared customer records. Official documentation · Oct 15, 2026Source	Supported6.4 / 6.4 pts Evidence Calls recorded on HubSpot contact/ticket. Official documentation · Oct 20, 2026Source	Not verified0–6.4 / 6.4 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source
Core capabilityAuto attendant or IVR3.2 points · Route callers using menus or automated receptionist rules.	Supported3.2 / 3.2 pts Evidence Apps, Team SMS, routing, connectors and Phone API. Official documentation · Oct 15, 2026Source	Not verified0–3.2 / 3.2 pts Evidence Not established in reviewed evidence; request this specific demonstration. Not verified · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Phone/app capabilities; advanced calling and AI require eligible tier. Official documentation · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Apps, auto-attendant and call handling. Official documentation · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Voice-menu routing. Official documentation · Oct 20, 2026Source	Supported3.2 / 3.2 pts Evidence US calling, apps and business call routing. Official documentation · Oct 15, 2026Source
Core capabilityGroups, queues or hours routing3.2 points · Route calls to multiple people or use business-hours routing.	Supported3.2 / 3.2 pts Evidence Apps, Team SMS, routing, connectors and Phone API. Official documentation · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Routing APIs direct inbound calls to departments or users. Official documentation · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Phone/app capabilities; advanced calling and AI require eligible tier. Official documentation · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Apps, auto-attendant and call handling. Official documentation · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Queues and hours-based answering. Official documentation · Oct 20, 2026Source	Supported3.2 / 3.2 pts Evidence US calling, apps and business call routing. Official documentation · Oct 15, 2026Source
Depth checkUnanswered-call overflow4.8 points · Configure an unanswered or over-capacity queue/group to move callers to another destination. Ask for a demonstration Leave a queue call unanswered and show the configured overflow route. A scenario to run with the supplier; not a completed product test.	Supported4.8 / 4.8 pts Evidence Administrative policies control overflow and live call transfer. Official documentation · Oct 15, 2026Source	Supported4.8 / 4.8 pts Evidence Main-line routing supports wait limits and fallback destinations. Official documentation · Oct 15, 2026Source	Supported4.8 / 4.8 pts Evidence Call flows combine forwarding, warm transfers and backup routes for unanswered calls. Official documentation · Oct 15, 2026Source	Not verified0–4.8 / 4.8 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source	Not verified0–4.8 / 4.8 pts Evidence Not established in the reviewed documentation. Not verified · Oct 20, 2026Source	Not verified0–4.8 / 4.8 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source
Depth checkHoliday and after-hours exceptions4.8 points · Override routine business-hours routing for holidays or explicit exceptions. Ask for a demonstration Create a holiday exception and show how its route differs from a normal weekday. A scenario to run with the supplier; not a completed product test.	Supported4.8 / 4.8 pts Evidence Call handling supports destination changes and holiday-specific routes. Official documentation · Oct 15, 2026Source	Supported4.8 / 4.8 pts Evidence Main-line settings include holiday overrides to standard hours. Official documentation · Oct 15, 2026Source	Supported4.8 / 4.8 pts Evidence Temporary call flows support holiday-specific routing. Official documentation · Oct 15, 2026Source	Supported4.8 / 4.8 pts Evidence RingEX supports call forwarding and custom holiday hours. Official documentation · Oct 15, 2026Source	Not verified0–4.8 / 4.8 pts Evidence Not established in the reviewed documentation. Not verified · Oct 20, 2026Source	Supported4.8 / 4.8 pts Evidence Schedule nodes support recurring and date-specific holiday routes. Official documentation · Oct 15, 2026Source
Core capabilityCRM or helpdesk integration2.4 points · Connect calling data with a named CRM or support application.	Supported2.4 / 2.4 pts Evidence Apps, Team SMS, routing, connectors and Phone API. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence Salesforce integration explicitly supports Dialpad Connect. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence Phone/app capabilities; advanced calling and AI require eligible tier. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence RingEX capability; AI and integration access depend on tier. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence HubSpot contact calling. Official documentation · Oct 20, 2026Source	Supported2.4 / 2.4 pts Evidence Salesforce/HubSpot connections require an add-on. Official documentation · Oct 15, 2026Source
Core capabilityCalling APIs or webhooks2.4 points · Use programmable interfaces to connect phone events or functions.	Supported2.4 / 2.4 pts Evidence Apps, Team SMS, routing, connectors and Phone API. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence Routing APIs direct inbound calls to departments or users. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence Phone/app capabilities; advanced calling and AI require eligible tier. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence RingEX capability; AI and integration access depend on tier. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence Calling API and event webhooks. Official documentation · Oct 20, 2026Source	Not verified0–2.4 / 2.4 pts Evidence Not established in reviewed evidence; request this specific demonstration. Not verified · Oct 15, 2026Source
Depth checkAutomatic CRM activity logging3.2 points · Write call activity into a connected CRM record with a usable contact association. Ask for a demonstration Complete a test call and show the automatically logged activity on the matching CRM contact. A scenario to run with the supplier; not a completed product test.	Not verified0–3.2 / 3.2 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Dynamics integration automatically logs calls and voicemail to matching contacts. Official documentation · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence HubSpot integration automatically associates calls, texts and summaries with CRM records. Official documentation · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Salesforce integration logs call activity against shared customer records. Official documentation · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Automatic HubSpot call records. Official documentation · Oct 20, 2026Source	Not verified0–3.2 / 3.2 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source
Depth checkCall records outside the phone app4 points · Retrieve identifiable call records or call events using an API, webhook, or export. Ask for a demonstration Retrieve a call record externally and identify its caller, time, and outcome. A scenario to run with the supplier; not a completed product test.	Not verified0–4 / 4 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source	Not verified0–4 / 4 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source	Not verified0–4 / 4 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source	Supported4 / 4 pts Evidence Call-log APIs and session webhooks expose call identifiers and recording metadata. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Call IDs, caller, time and outcome. Official documentation · Oct 20, 2026Source	Not verified0–4 / 4 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source
Core capabilityAI call transcription2.4 points · Create a transcript of a live or completed business call.	Supported2.4 / 2.4 pts Evidence US Phone plans and eligible AI Companion features. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence Connect calling, apps, messages, transcripts and action recaps. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence Phone/app capabilities; advanced calling and AI require eligible tier. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence RingEX capability; AI and integration access depend on tier. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence Recorded-call transcription. Official documentation · Oct 20, 2026Source	Supported2.4 / 2.4 pts Evidence AI transcripts and summaries on Scale. Official documentation · Oct 15, 2026Source
Core capabilityAI summaries or follow-up actions2.4 points · Summarize a call or extract decisions and follow-up tasks.	Supported2.4 / 2.4 pts Evidence US Phone plans and eligible AI Companion features. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence Connect calling, apps, messages, transcripts and action recaps. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence Phone/app capabilities; advanced calling and AI require eligible tier. Official documentation · Oct 15, 2026Source	Supported2.4 / 2.4 pts Evidence RingEX capability; AI and integration access depend on tier. Official documentation · Oct 15, 2026Source	Not verified0–2.4 / 2.4 pts Evidence Not established in the reviewed documentation. Not verified · Oct 20, 2026Source	Supported2.4 / 2.4 pts Evidence AI transcripts and summaries on Scale. Official documentation · Oct 15, 2026Source
Depth checkAI answers grounded in call content3.2 points · Use an AI query or extraction capability based on a call’s actual transcript or recording. Ask for a demonstration Ask about a decision or fact in a specific call and inspect the matching transcript context. A scenario to run with the supplier; not a completed product test.	Supported3.2 / 3.2 pts Evidence Call questions use transcript content; admins scope or disable processing. Official documentation · Oct 15, 2026Source	Not verified0–3.2 / 3.2 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence Per-number AI controls, shared call history and MCP transcript analysis are documented. Official documentation · Oct 15, 2026Source	Supported3.2 / 3.2 pts Evidence The RingEX Phone MCP preview searches real call insights by person, topic and date. Official documentation · Oct 15, 2026Source	Not verified0–3.2 / 3.2 pts Evidence Transcript keyword/parameter analysis; open-ended answers unverified. Not verified · Oct 20, 2026Source	Not verified0–3.2 / 3.2 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source
Depth checkAdministrative AI processing control4 points · Let an administrator disable or scope AI transcription, analysis, or summaries. Ask for a demonstration Show the setting that limits AI processing for a selected user, line, or call. A scenario to run with the supplier; not a completed product test.	Supported4 / 4 pts Evidence Call questions use transcript content; admins scope or disable processing. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Company, office and shared-line administrators can disable AI. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Per-number AI controls, shared call history and MCP transcript analysis are documented. Official documentation · Oct 15, 2026Source	Supported4 / 4 pts Evidence Published RingEX guidance describes user and organizational AI toggles. Official documentation · Oct 15, 2026Source	Not verified0–4 / 4 pts Evidence Not established in the reviewed documentation. Not verified · Oct 20, 2026Source	Not verified0–4 / 4 pts Evidence This specific workflow has not been established by the reviewed evidence. Not verified · Oct 15, 2026Source
Depth checkAutomatically mask sensitive transcript content2.5 points · Demonstrate "Automatically mask sensitive transcript content" with test data. Show the result, an exception case, and the required plan. Ask for a demonstration Demonstrate "Automatically mask sensitive transcript content" with test data. Show the result, an exception case, and the required plan. A scenario to run with the supplier; not a completed product test.	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source
Depth checkPark a call and retrieve it on another extension2.5 points · Park an internal test call, retrieve it from another extension, then demonstrate the timeout when nobody retrieves it. Ask for a demonstration Park an internal test call, retrieve it from another extension, then demonstrate the timeout when nobody retrieves it. A scenario to run with the supplier; not a completed product test.	Supported2.5 / 2.5 pts Evidence Zoom Phone policies can enable or disable call parking for supported users and devices. Zoom Phone calling plan or Workplace with Phone plus admin privileges; supported device/client and destination conditions apply. Official documentation · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source
Depth checkSign in temporarily on a shared desk phone2.5 points · Demonstrate "Sign in temporarily on a shared desk phone" with test data. Show the result, an exception case, and the required plan. Ask for a demonstration Demonstrate "Sign in temporarily on a shared desk phone" with test data. Show the result, an exception case, and the required plan. A scenario to run with the supplier; not a completed product test.	Supported2.5 / 2.5 pts Evidence Zoom Phone policies expose hot desking for supported common-area phones. Zoom Phone calling plan or Workplace with Phone plus admin privileges; supported device/client and destination conditions apply. Official documentation · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source
Depth checkDelegate calls on behalf of another user2.5 points · Demonstrate "Delegate calls on behalf of another user" with test data. Show the result, an exception case, and the required plan. Ask for a demonstration Demonstrate "Delegate calls on behalf of another user" with test data. Show the result, an exception case, and the required plan. A scenario to run with the supplier; not a completed product test.	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source
Depth checkPause and resume an active call recording2.5 points · Demonstrate "Pause and resume an active call recording" with test data. Show the result, an exception case, and the required plan. Ask for a demonstration Demonstrate "Pause and resume an active call recording" with test data. Show the result, an exception case, and the required plan. A scenario to run with the supplier; not a completed product test.	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source
Depth checkMove an ongoing mobile VoIP call to the carrier2.5 points · Demonstrate "Move an ongoing mobile VoIP call to the carrier" with test data. Show the result, an exception case, and the required plan. Ask for a demonstration Demonstrate "Move an ongoing mobile VoIP call to the carrier" with test data. Show the result, an exception case, and the required plan. A scenario to run with the supplier; not a completed product test.	Supported2.5 / 2.5 pts Evidence An administrator can enable Mobile Switch to Carrier at documented policy levels. Zoom Phone calling plan or Workplace with Phone plus admin privileges; supported device/client and destination conditions apply. Official documentation · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source
Depth checkRestrict outbound calling destinations2.5 points · Demonstrate "Restrict outbound calling destinations" with test data. Show the result, an exception case, and the required plan. Ask for a demonstration Demonstrate "Restrict outbound calling destinations" with test data. Show the result, an exception case, and the required plan. A scenario to run with the supplier; not a completed product test.	Supported2.5 / 2.5 pts Evidence International calling is an administrative policy at multiple account levels. Zoom Phone calling plan or Workplace with Phone plus admin privileges; supported device/client and destination conditions apply. Official documentation · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source
Depth checkRestrict recording access by IP address2.5 points · Demonstrate "Restrict recording access by IP address" with test data. Show the result, an exception case, and the required plan. Ask for a demonstration Demonstrate "Restrict recording access by IP address" with test data. Show the result, an exception case, and the required plan. A scenario to run with the supplier; not a completed product test.	Supported2.5 / 2.5 pts Evidence IP Access Control restricts access to recordings, voicemail and other phone assets. Zoom Phone calling plan or Workplace with Phone plus admin privileges; supported device/client and destination conditions apply. Official documentation · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source	Not verified0–2.5 / 2.5 pts Evidence This specific check has not been verified. Missing evidence does not mean the capability is absent. Ask for a demonstration in the proposed plan. Not verified · Oct 21, 2026Source

WHAT WE MEASURE

The criteria behind the score.

The established 20 checks contribute 80 points. Eight new operational checks contribute 20 points. AI checks are included in their own group and are excluded when AI priority is set to zero. These assess documented capability scope, not measured performance. Adjust group priorities in the comparison tool.

See the complete calculation →

US business calling 20%
US numbers and calling plans must match the organization's actual destinations and volume.
Team calling and messaging 20%
Shared lines, messaging and device continuity determine how a team works together.
Call routing and administration 16%
Routing and administrative controls turn individual numbers into an operable business service.
Business application connections 12%
Connected applications reduce duplicate work when they support the exact required data exchange.
AI call assistance and agents 14.5%
AI should have a defined job, with plan limits and human oversight appropriate to that job.
Operational detail 17.5%
Specific workflow, integration and control checks beyond the established rubric.

THE PRACTICAL BUYER’S GUIDE

How to choose business phone systems.

A business phone system should make incoming calls reach the right person and let staff work consistently across devices. Buying decisions often begin with a seat price, but everyday suitability depends on routing, shared numbers, administration and the team's existing applications. A small service business may value a shared calling-and-texting inbox. A distributed company may need multi-level menus, queues, location controls and centralized provisioning. AI summaries and receptionists can reduce particular tasks, but they do not establish call quality or reliability. Treat those as separate questions for a pilot. This category assesses documented functions and plan boundaries, with US calling eligibility and add-on costs considered explicitly.

Map your current call flows before requesting quotes

Draw what should happen to a sales inquiry, an existing-customer issue and an after-hours call. Include holidays, unavailable employees and calls that wait too long. Identify which numbers must stay with the business and who owns the records needed to move them. Ask each vendor to configure the same sample flow. Check the experience on the devices employees actually use, including headsets and mobile apps. A feature list can show that routing exists without showing whether your team can maintain it. Assign an administrator and a backup, then have both make a routine change during the evaluation.

Separate calling, messaging and AI requirements

Document calling destinations, business texting needs, shared inbox requirements and meeting tools independently. Unlimited calling language may apply to a specified geography and remain subject to the provider's terms; it should not be read as unlimited use of every channel or feature. Team SMS, advanced queues, CRM connections and AI receptionists may have separate packaging. For AI, distinguish post-call summaries from an agent that talks to customers and takes actions. Demonstrate the exact function you intend to buy. A recording or summary should also be discoverable, access-controlled and manageable under your organization's retention process rather than accumulating without an owner.

Pilot the migration and the operating routine

Use a limited group and temporary numbers to verify device behavior, routing, transfers and support responsiveness before moving critical numbers. Ask how porting dates, rollback options and service interruptions are handled. Have the team rehearse an internet outage and an employee departure. Confirm how to revoke access, reassign numbers and retrieve needed business records. Review the full invoice structure: licenses, numbers, usage, hardware, AI and applicable fees. A low introductory quote can hide a different renewal cost or commitment. Keep a written inventory of included features and require the proposal to identify paid add-ons needed for your demonstrated workflow.

What changes the total cost?

Per-user subscriptions, billing commitment, renewal terms and additional numbers.
International or metered calling, texting, hardware and applicable fees.
AI receptionists, advanced queues, integrations and migration assistance.

Where purchases go wrong

Assuming every feature on a product page is included in the entry plan.
Moving critical numbers before verifying the target call flows and support process.
Treating an AI summary feature as an autonomous receptionist or full contact center.

Bring these questions to the demo

Configure our after-hours and unanswered-call flow, including an unavailable transfer target.
Which required features cost extra beyond the quoted seats?
Show how a departing employee's number, messages and recordings are reassigned.
What is the number-porting plan and how will we handle an unexpected delay?

Questions buyers ask

Is a cloud PBX the same as a contact center?

They overlap, but a contact center typically serves more specialized agent and customer-service workflows. Do not infer advanced workforce, quality or queue functionality from the phone-system label. Compare the operational features required by your team and the exact products included in the quote.

Should a small business choose the cheapest seat?

Only after checking the complete workflow and bill. A plan that needs extra users, integration tiers or an AI add-on can cost more than its headline suggests. Conversely, an expensive bundle offers little value when the team will not use its additional capabilities.

How much should AI affect the choice?

Our capability model gives AI 15% of category weight. That reflects a useful dimension without allowing AI to override core calling and routing needs. It is not a measured productivity score. Test summaries or receptionist behavior using your own calls and review process.

Business phone systems

Compare the options.

Zoom Phone

Dialpad Connect

Quo (formerly OpenPhone)

RingCentral RingEX

Zadarma

Nextiva