[asterisk-dev] [Code Review] 3106: res_pjsip_session: If a reinvite without an SDP is received, unhold the call.

[Jonathan Rose]

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Review request for Asterisk Developers, Joshua Colp and Mark Michelson.


Repository: Asterisk


Description
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Some devices apparently perform unhold by simply issuing a reinvite on the dialog without an SDP. This patch adds that functionality to our PJSIP session control.
It might be worthwhile to add some method of not queing unhold if the call isn't already on hold in the first place, but my testing so far hasn't revealed it as being necessary.


Diffs
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  /trunk/res/res_pjsip_session.c 404854 

Diff: https://reviewboard.asterisk.org/r/3106/diff/


Testing
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Created a phone_B.xml similar to the ones used for this case in review 3105 (phone_B_unhold_sans_sdp.xml). This would hold the call then unhold the call by sending a reinvite without an SDP

pjsip endpoint:

[sippbert]
type=aor
contact=sip:sippbert at 127.0.0.3:5065

[sippbert]
type=endpoint
aors=sippbert
context=default
disallow=all
allow=ulaw
direct_media=no


With the patch in place, this held and unheld the call as it should have.  Without the patch, the hold would work (naturally since it's just a normal hold), but the invite without the SDP would not unhold the call.

It's worth noting that if an unhold in this fashion is issued while the call is already active/not on hold will still produce unhold events. I'm unsure if this is a problem that needs to be addressed. Testing hasn't revealed this being a problem yet, but I don't believe many test scenarios exist which use reinvites without SDP.


Thanks,

Jonathan Rose

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