res_pjsip_sdp_rtp.c: Fix native formats containing formats that were not negotiated.
Outgoing PJSIP calls can result in non-negotiated formats listed in the
channel's native formats if video formats are listed in the endpoint's
configuration. The resulting call could then use a non-negotiated format
resulting in one way audio.
* Simplified the update of session->req_caps in set_caps(). Why do
something in five steps when only one is needed?
AFS-162 #close
Review: https://reviewboard.asterisk.org/r/4000/
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Merged revisions 423561 from http://svn.asterisk.org/svn/asterisk/branches/13
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@423563
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