I use the lastest Freepbx 14 Distro.
I need to send specific P-Access-Network-Info SIP Header in INVITE on outgoing calls for my voip carrier to handle emergency numbers.
Each extension will use the same outgoing route with a carrier class SIP Trunk.
To handle the emergency numbers routing related to the extension geographical location, I need for each extension to send in INVITE the P-Access-Network-Info Header with a specific code for each extension.
Here is an exemple :
P-Access-Network-Info: IEEE-802.3;operator-specific-GI="00<CODEINSEE>00"; network-provided
I will use SIP Extensions (no PJSIP).
I need for each extension to define the CODEINSEE transmitted in SIP Header.