fix(mod_sofia): use profile sipip (not session host) for PAI callee_number on Polycom endpoints

[gaurang1102]

Description

In sofia_glue_do_invite(), FreeSWITCH builds the P-Asserted-Identity (PAI) header's callee_number URI by formatting it as sip:NUMBER@HOST. The variable host is derived from the SIP session's remote address — which for on-net Polycom calls is the Polycom device's IP, not the SIP server's IP.

Polycom endpoints resolve P-Asserted-Identity URIs against the registrar/proxy address, not the originating device address. When callee_number in the PAI header uses the session host (device IP), Polycom phones cannot resolve the identity, causing the display name on the called Polycom to be blank or incorrect for on-net transfers and attended transfers.

The existing condition !switch_stristr("polycom", ua) (present since at least 1.10.x) was added to skip the sip:number@host formatting for Polycom UAs entirely — but this leaves callee_number unformatted, which causes a different set of issues with the PAI header URI being invalid.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Code cleanup / refactor

Related Issues

#3096 (comment)

Testing

(1) Register two Polycom VVX phones (UA string contains "Polycom") against FreeSWITCH via mod_sofia.
(2) Place a call from Phone A to Phone B (on-net, both registered to same FS profile).
(3) Capture the SIP INVITE sent from FreeSWITCH to Phone B with a packet capture or sofia global siptrace on
(4) Inspect the
P-Asserted-Identity
header in the INVITE to Phone B.
(5) Observe that
callee_number
URI in the PAI header either uses Phone A's IP address as the host (incorrect) or is left unformatted.
(6) Phone B displays an incorrect or unresolvable caller identity.

• Added/updated unit tests
• Tested manually
• Tested with live SignalWire credentials (if applicable)

Checklist

• I have read the CONTRIBUTING guidelines
• My code follows the project's style guidelines
• I have added tests for my changes (if applicable)
• I have updated documentation (if applicable)
• All existing tests pass

Additional Notes