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Daily supports connecting standard phone and SIP participants to video calls, enabling telephony integration for contact centers, conferencing, and voice bot applications.

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Prerequisites

  • Paid Daily account — add a credit card in the dashboard.
  • Dial-out approval — fill out the dial-out request form to avoid fraud and misuse. Once approved, set enable_dialout on your rooms.
  • Default limit: max_sip_pstn_sessions_per_room = 5. Contact support to increase this.
We’ve removed the requirement for a paid-support plan for SIP and PSTN dial-in, it is now available for all pay-as-you-go accounts. You just need to have a credit card associated to your domain.

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SIP

Daily supports SIP dial-in and SIP dial-out with the following codecs:
  • Audio: PCMU, PCMA, G722, Opus (default: PCMU/PCMA)
  • Video: H264, VP8 (default: VP8)
If a codec is not supported by the remote party, Daily transcodes the stream (transcoding charges apply — see pricing). Tested with CPaaS vendors (Twilio, Telnyx, SignalWire) and SIP hardware phones (Poly, Cisco). For full SIP setup details, see the SIP guide.

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PSTN phone numbers

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Global dial-in numbers

You can receive PSTN calls without purchasing a phone number. Daily provides global dial-in numbers in 27 countries. Each room gets a unique 11-digit PIN code, generated at room creation and deleted when the room expires. Free tier includes US and Canada:
  • US: +1 (209) 503-8039
  • CA: +1 (226) 807-8039
Access to the other 25 countries (including all major European countries, Japan, Singapore, Malaysia, India, China, Hong Kong, Brazil, Mexico) requires a paid support plan. See this page for the full list of countries and numbers.

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Purchasing phone numbers

Daily’s REST API supports purchasing phone numbers in the US and Canada (+1). A single number can handle hundreds of simultaneous calls. A purchased number can can be used for PSTN dialout. However, a number can only be assigned to either PIN dial-in or pinless dial-in, but not both.

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PSTN dial-in methods

Daily supports two PSTN dial-in flows:
  • PIN dial-in — callers dial a phone number and enter a room-specific PIN code.
  • SIP Interconnect and Pinless dial-in — incoming calls trigger a webhook where you can define logic to route the call to a Daily room without requiring a PIN.

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PSTN dial-out

Dial-out checklist (once your account is approved):
  1. Purchase a phone number (skip if dialing a SIP URI)
  2. Enable dial-out on the room
  3. Join the room with an owner token
  4. Dial US/Canada (+1) numbers in E.164 format (e.g., +16505551212). For international dial-out, contact help@daily.co.
Dial out to a mobile or PSTN phone number from within a Daily room:

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DTMF tones

Send DTMF (touch-tone) signals during a call — commonly used for IVR interactions: DTMF is sent in-band and as an RTP telephone event per RFC 2833/RFC 4733. SIP INFO (RFC 6086) is not supported. Receiving DTMF from a PSTN/SIP connection into a Daily room is not yet supported.

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Call transfers

Daily provides two transfer methods. Both methods maintain the original SIP/PSTN connection, meaning the initial caller’s connection does not disconnect during the transfer:
  • SIP Call Transfer — keeps the original SIP leg anchored to Daily and redirects the far end to a new SIP or PSTN destination. Both connections remain active and billable.
  • SIP REFER — hands the call off to the originating SIP system. Daily exits the call entirely. A one-time SIP REFER fee may apply.