I’m new to FreePBX and this whole world of VoIP but I’m a software engineer and not easily intimidated. However, I’ve been banging my head for hours trying to figure this out and not succeeding.
I’m forwarding calls to Anveo Direct using a Custom Device with a dial string like “[PREFIX][email protected]”. Now I want to tell Anveo which carrier routes to use for the call and to do this I need to add a SIP header like this to each SIP Invite: “X-ANVEO-LCR: routes=1,2,3,4”. I can’t figure out how to add the header, and I’m able to verify from Anveo’s SIP trace that everything I’ve tried hasn’t succeeded.
I’ve tried using the [macro-dialout-trunk-predial-hook] as explained here but it’s not helping.
What should I try next?