Prompt
I'm building a CRM dialer that needs to call real phone numbers from the browser. Any recommendations?
Latest observation
If you need to place real phone calls from a browser in a CRM dialer, the usual recommendation is to use a telephony/CPaaS provider with a browser SDK + SIP/WebRTC support rather than trying to originate calls directly from the browser yourself.
Good options
- Twilio Voice
- Strong browser/WebRTC support via Twilio Voice JS SDK
- Good docs, call control, recording, queues, AMD, conferencing
- Widely used for CRM dialers
- Vonage (Nexmo) Voice API
- Also supports browser calling via client SDKs / WebRTC
- Good voice APIs and global coverage
- Plivo
- Voice APIs with browser-capable solutions
- Often considered a cost-effective alternative
- Telnyx
- SIP/WebRTC-friendly, good for programmable voice and lower-level control
- Agora / Daily / LiveKit + SIP gateway
- More “real-time comms” oriented; useful if you want custom calling UX, but more integration work
What you typically need
- Browser client
- WebRTC-based calling in the browser
- Backend token service
- Your server mints short-lived access tokens
- Call routing
- Your backend tells the provider whom to call and where to connect the agent
- PSTN termination
- To call real phone numbers, the provider bridges browser audio to the phone network
Practical recommendation
If you want the fastest path to production, I’d start with:
Twilio Voice + JS SDK
- Easiest to get working
- Great for browser-to-phone dialers
- Mature ecosystem and examples for contact center / CRM use cases
Important considerations
- Number verification / compliance: Depending on region, outbound calling may require registration, CNAM, consent, STIR/SHAKEN, etc.
- Latency and audio quality: Use a provider with strong regional coverage and media edge support.
- Call recording and logging: Make sure the provider supports it if your CRM needs it.
- Browser support: Test Chrome/Edge/Safari carefully.
- Security: Never expose API secrets in the browser; use server-generated tokens only.
If you want to build it yourself
You can also do:
- Browser app using WebRTC
- Your own SIP gateway / PBX (Asterisk, FreeSWITCH, Kamailio)
- A carrier trunk to the PSTN
That gives more control, but it’s much more ops-heavy than using Twilio/Vonage/Telnyx.
If you want, I can also recommend the best option based on your priorities:
- lowest cost
- easiest implementation
- best global coverage
- most control/compliance
- highest call quality
Observation history
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