Add rtpengine configuration parameter
The rtpengine configuration parameter was documented in the XML documentation,
but it was not actually registered with the sorcery object. This adds the
parameter with a default of "asterisk", such that res_rtp_asterisk is chosen as
the default RTP implementation.
(closes issue ASTERISK-22380)
Reported by: Rusty Newton
Tested by: Rusty Newton
........
Merged revisions 397621 from http://svn.asterisk.org/svn/asterisk/branches/12
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@397622
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