We are working on implementing STIR/SHAKEN and have run into a snag when passing calls through our FreeSwitch LCR which sits between our call feature server and our SBC's. Our call feature server is passing parameters in the Contact for attestation-info and origination-id. It is intended that our SBC's will extract this data from the Contact and use it to generate an identity header before leaving our network. Ideally this information would be passed via X-Header(s) but unfortunately this is what we have to work with at the moment.

We have tried to use both the "sip_invite_contact_params" and "sip_contact_params" channel variables but neither of them seem to get any data from the Contact within the inbound INVITE. We had success testing with "sip_contact_user" and dumping that data to an X-Header but we can't seem to get FreeSwitch to recognize or dump the other parameters.

When debugging an active call and dumping the channel variable data for each leg of the call we don't see any of the additional parameters that are in the Contact listed in the channel variables that are dumped for either call leg's UUID.

Contact in INVITE into FreeSwitch
Contact: <sip:15558675309@x.x.x.x:5060>;isup-oli=00;attestation-info=1;origination-id=1000;verstat=0

sip_contact_user Dump to X-Header:
X-ContactUser: 15558675309

FreeSwitch Logging:
EXECUTE [depth=0] sofia/core/15558675309@x.x.x.x:5060 export(sip_h_X-ContactUser=15558675309)
2021-06-18 15:24:10.079576 [DEBUG] switch_channel.c:1310 EXPORT (export_vars) [sip_h_X-ContactUser]=[15558675309]
EXECUTE [depth=0] sofia/core/15558675309@x.x.x.x:5060 export(sip_h_X-ContactParam=)
2021-06-18 15:24:10.079576 [DEBUG] switch_channel.c:1310 EXPORT (export_vars) [sip_h_X-ContactParam]=[UNDEF]

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