SIP REFER on externally forwarded call

[smeyer]

I am making a new post as I realize I did not fully understand the issue previously (sorry).
Due to STIR/SHAKN and Twilio rules, external transfers like in a call forward scenario, must be initiated in the original inbound SIP dialog. When looking up the proper application, it seems that using "Deflect" SHOULD do that. Now, when I change "call_forward_all" dialplan to deflect instead of transfer, nothing happens. I have attached what my log shows for this action. There is nothing sent in the SIP flow and the call just terminates.
Twilio has a good diagram if someone needs a visual of the proper flow. https://www.twilio.com/docs/sip-trunking/call-transfer

 

[DigitalDaz]

Freeswitch is a B2BUA, you shouldn't be needing to use refer at carrier level. The call forwarding is done within the PBX so the forward is just like a regular external call.

 

[smeyer]

Freeswitch is a B2BUA, you shouldn't be needing to use refer at carrier level. The call forwarding is done within the PBX so the forward is just like a regular external call.

New regulations as well as a few carriers do not let you send an outbound call w/o the CID being verified. So if you want to forward externally and maintain the callee CID, you must use a refer. There are several other companies including bandwidth that have not moved but will be enacting this.

 

[Adrian Fretwell]

Many carriers will not accept REFER. We always respond to a REFER method with 405 "Method Not Allowed". The B2BUA is the way to go.

 

[smeyer]

Many carriers will not accept REFER. We always respond to a REFER method with 405 "Method Not Allowed". The B2BUA is the way to go.

Twilio is requesting it.