[asterisk-dev] [Code Review] Initialize udptl only when dialog negotiates for image media

[Matt Jordan]

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https://reviewboard.asterisk.org/r/1668/
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Review request for Asterisk Developers, Joshua Colp, Mark Michelson, Terry Wilson, and schmidts.


Summary
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Currently, the udptl object is allocated in one of three places:
1) create_addr_from_peer
2) sip_alloc
3) handle_request_invite

This typically results in any dialog associated with a peer having a udptl object (and its associated UDP ports, system resources, etc.) assigned to it.  This includes non-INVITE requests.

This patch moves the initialization of a dialog's udptl object to either (a) when the media is negotiated for that dialog, or (b) if a control frame is received in chan_sip indicating that the dialog needs to support T.38.  This should result in only those dialogs that are explicitly involved with sending / receiving image media having a udptl object assigned to them.


This addresses bugs ASTERISK-16698 and ASTERISK-16794.
    https://issues.asterisk.org/jira/browse/ASTERISK-16698
    https://issues.asterisk.org/jira/browse/ASTERISK-16794


Diffs
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  /branches/1.8/channels/chan_sip.c 350786 

Diff: https://reviewboard.asterisk.org/r/1668/diff


Testing
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Patch passes the udptl tests in the Asterisk Test Suite.  Since the T.38 gateway tests are Asterisk 10 specific, a patch still needs to be written for Asterisk 10 and pass there.  However, given the complexity and number of ways in which media can be negotiated, additional testing would be appreciated from the open source community.


Thanks,

Matt

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