Callback to allow application to respond to re-INVITE manually (thanks Ruud Klaver for the patch)

[bennylp]

Currently PJSIP automatically responds incoming re-INVITE. The patch adds callback to notify application about re-INVITE and allows it to respond accordingly.

See the following for the discussions:

• ​http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/2009-January/005944.html
• (related) ​http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/2009-April/007241.html

[bennylp]

Patch to add the callback (thanks Ruud Klaver)

[bennylp]

This patch adds capability to cancel remote offer state in the SDP negotiator. It's useful if application has set the remote offer, but then decides to reject the re-INVITE.

[bennylp]

Patch from Ruud Klaver to cancel incoming re-INVITE on incoming CANCEL

[bennylp]

Patch from Ruud Klaver to cancel negotiator state when we're sending negative response to re-INVITE

[bennylp]

From Saúl Ibarra Corretgé: this patch should complete the missing part. The attached patch builds and sends a CANCEL request to an ongoing re-INVITE. I made the patch and tested on PJSIP 1.0.x version, but AFAIS there should be no problem in applying it to latest trunk.

[bennylp]

Moving this to known issues.

[ming]

In 4562:

Re #817: Initial work for allowing application to respond to re-INVITE manually.

Patches integrated in this fix (with some modifications for adjustment to the current trunk):

• sip_inv-on_rx_reinvite.patch

Move the place where to call the callback so the callback will still be called when the re-invite contains no SDP

• sdp_neg_cancel_remote_offer

pjmedia_sdp_neg_cancel_remote_offer() is no longer necessary since pjmedia_sdp_neg_cancel_offer() can already handle that. Only integrate the chart for sdp negotiation doc.

• sip_inv-terminate-reinvite-tsx-on-cancel
• sip_inv-cancel_sdp_neg_on_sending_negative_reply_to_reinvite
• pjsip-allow_cancel_reinvite

[bennylp]

In 4565:

More re #817: added logging

[ming]

In 4583:

Re #817: Fix replying to re-INVITE after it was cancelled (thanks to Saúl Ibarra Corretgé for the patch)

[bennylp]

Note that this implementation is still lacking manual reinvite notification at pjsua level, although it's still unclear either whether such notification can be implemented.