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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

1. Changed "action transfer ${forward_all_destination} XML ${domain_name}" to action deflect "${forward_all_destination} XML ${domain_name}" on call_forward_all
2. Placed a call to an extension with a forwarded number (cell)
3. Call connects to PBX and then disconnects on deflect with no refer sent to carrier in original call leg.

The call forward should initiate a refer to the carrier letting them know to transfer the call.

Freeswitch 1.10.7 with Fusion 5.0.1 deflect issue.txt