sipCallTransfer and sipRefer

Daily provides two primary methods for handling transfers: PSTN and SIP call transfers (sipCallTransfer), along with SIP REFER (sipRefer). Each method serves distinct use cases and maintains the original connection during the transfer process, ensuring seamless call continuity.

PSTN and SIP Call Transfer keeps the original SIP connection anchored to Daily. Only the far end of the call is redirected to a new SIP or PSTN destination. Because Daily remains in the media path, usage continues to be billed on both connections. The exact cost depends on whether the target is a SIP address or a PSTN number.
SIP REFER hands the call back to the originating SIP system. The original SIP endpoint then establishes a direct connection to the target SIP endpoint, and Daily exits the call entirely. A one-time SIP REFER fee may apply when invoked.

Read more details about the differences between call transfer and SIP REFER on our doc-site

Note: When transferring to an external SIP address or PSTN phone number, the call remains anchored on Daily. Both call connections stay active during the transfer period, and usage continues to be billed accordingly.

Each call to `/sipRefer` API is billed separately. A one-time SIP REFER fee may apply when the REFER request is invoked. Contact support to understand pricing

Implementation Options

You can implement these transfers through REST API endpoints:

Pricing Considerations

The choice between sipCallTransfer and sipRefer affects how usage is billed. sipCallTransfer keeps the call anchored to Daily, so usage continues to accrue on the active connections for the duration of the transfer. sipRefer, by contrast, removes Daily from the call flow once the REFER succeeds; a one-time SIP REFER fee may apply when the REFER is invoked.

For detailed pricing information and guidance on which method best suits your needs, please contact:

Email: help@daily.co
Sales team: Contact for enterprise pricing and volume discussions