Short answer: every option below embeds calls in the Salesforce console through Omni-Channel. They differ in who runs the telephony, how routing and AI work, how support and billing are split, and which limitations they document. Choose the one whose limits do not break your workflow.
This guide compares the Salesforce-managed Amazon Connect model with the leading bring-your-own-telephony (BYOT) partners. It focuses on capabilities. For prices, see our Salesforce Voice cost comparison.
Core capabilities
| Option | Telephony platform | Set-up and integration | Routing engine | AI and transcription | Support and billing |
|---|---|---|---|---|---|
| Amazon Connect (Salesforce-managed) | Native Amazon Connect | Provisioned by Salesforce | Salesforce Omni-Channel | Amazon Transcribe and Einstein; live transcript | One vendor, one bill |
| Zoom Contact Center | Zoom Phone and Contact Center | AppExchange package configuration | Zoom routing synced to Omni-Channel | Zoom AI Expert Assist; VoiceCall transcript | Salesforce and Zoom; two bills |
| NICE CXone | NICE CXone | AppExchange package configuration | CXone skills and Studio synced to Omni-Channel | NICE Enlighten AI; real-time and final transcripts | Salesforce and NICE; two bills |
| Talkdesk | Talkdesk CX Cloud | AppExchange package configuration | Talkdesk Studio synced to Omni-Channel | Talkdesk AI and Copilot summaries; transcript | Salesforce and Talkdesk; two bills |
| Five9 (Fusion) | Five9 Intelligent CX | Partner telephony integration | Five9 routing synced to Omni-Channel | Five9 Agent Assist or Einstein; TranscriptStream | Salesforce and Five9; two bills |
| RingCentral RingCX | RingCX | AppExchange package configuration | RingCX routing synced to Omni-Channel | RingSense AI; live transcription | Salesforce and RingCentral; two bills |
| Twilio Flex | Twilio Flex and Voice | API-first, highly customisable | Twilio TaskRouter synced to Omni-Channel | Twilio AI or custom models; Conversation Intelligence | Salesforce and Twilio; two bills |
Limitations and differentiators
The limitations below come from each vendor's published Salesforce integration documentation as reviewed in autumn 2026. Integrations change often, so confirm each point with the vendor before you commit.
| Option | Documented limitations to check | Main differentiator |
|---|---|---|
| Amazon Connect (Salesforce-managed) | The AWS account carries service-policy restrictions | Single-vendor support and billing |
| Zoom Contact Center | No browser refresh during an active call and no multiple Salesforce Voice tabs; recordings need an Omni-Channel login | Unified video and voice in one ecosystem |
| NICE CXone | Omni-Channel Flows, non-voice channels and voicemail not supported in the reviewed guide | Workforce engagement management (WEM) |
| Talkdesk | No automatic queue sync or Omni-Channel Flow skills routing; external call interactions on the first leg only | Fast global deployment and carrier reach |
| Five9 (Fusion) | Concurrent-seat model with a 50-seat minimum; WEM licensed per named user | Mature enterprise reliability and integrations |
| RingCentral RingCX | Exact Salesforce channel embedding and minute coverage need a quote | UCaaS and contact centre closely combined |
| Twilio Flex | The Salesforce Voice integration is not covered for HIPAA or PCI; transcripts stored in both systems | Developer flexibility and custom interfaces |
Choosing the right fit
Ask three questions before you shortlist:
- Do you want a single vendor, or do you already run a contact centre or UCaaS platform you want to keep?
- Which AI and workforce features are essential to your operation?
- Does any documented limitation break an agent workflow you rely on?
As a starting point: Amazon Connect for simplicity, NICE or Five9 for enterprise scale, Zoom or RingCX if you are already on their UCaaS, Talkdesk for fast deployment, and Twilio for developer flexibility. Always test the limitations against your own workflows.
Frequently asked questions
What is partner telephony in Salesforce Voice?
It means using your own contact centre provider, such as Zoom, NICE, Talkdesk, Five9, RingCentral or Twilio, with Salesforce Voice, instead of Amazon Connect supplied by Salesforce.
Which Salesforce Voice option has one bill?
The Salesforce-managed Amazon Connect model, where Salesforce provides and bills the telephony. Partner options usually mean two vendors and two bills.
Do all partners support Omni-Channel?
All the options here embed calls through Omni-Channel, but they differ in which Omni-Channel features, such as Flows and skills routing, they support.
Which option is best?
It depends on your existing platforms, the AI and workforce features you need, and whether any documented limitation breaks your workflows.
Need help shortlisting a telephony partner? Talk to us.