Can I transfer calls using SIP REFER?
- SIP REFER
SIP REFER is not supported. This can be seen in the Allow header, where refer is not listed as a supported method.
As you pay for inbound and outbound calls, if you use REFER for an inbound call to another PSTN party, you would pay for both the inbound and outbound calls while being unable to control the call.
We recommend using Voice API for this use case so that you can remain in control of the conversation.