Opened 5 years ago

Closed 5 years ago

#2123 closed enhancement (fixed)

Follow SDP answer changes in 18x & 2xx responses

Reported by: nanang Owned by: bennylp
Priority: normal Milestone: release-2.8
Component: pjsip Version: trunk
Keywords: Cc:
Backport to 1.x milestone: Backported: no


Previously, tickets #657, #1644, and #1764 allowed invite session to follow SDP answer changes in forking scenario (i.e: when responses have different To tags). This ticket expands the behavior to non-forking scenario, as long as the previous 18x response is not reliable (i.e: using 100rel), this should be inline with RFC 6337 section 3.1.1.

This new behavior can be turned off via compile-time setting PJSIP_ACCEPT_MULTIPLE_SDP_ANSWERS or run-time setting pjsip_cfg()->endpt.accept_multiple_sdp_answers. Application can inspect the new flag inv->updated_sdp_answer to check if the SDP negotiation was done with an initial or an updated SDP answer. Furthermore, the existing flag inv->following_fork can be used for checking whether the SDP answer update was on forking scenario.

Thanks George Joseph for the feedback and the patch.

Change History (2)

comment:1 Changed 5 years ago by nanang

In r5812: Follow SDP answer changes in 18x & 2xx responses on non-forking scenario.

comment:2 Changed 5 years ago by nanang

  • Resolution set to fixed
  • Status changed from new to closed
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