[Asterisk-Dev] more on Cisco BTS problem

[Alex Zeffertt]

Bill,

It looks like the BT phone is doing something very uncommon, but
nonetheless correct, as this snip from rfc2327 shows:


     For applications where hierarchically encoded streams are being
     sent to a unicast address, it may be necessary to specify multiple
     transport ports.  This is done using a similar notation to that
     used for IP multicast addresses in the "c=" field:

          m=<media> <port>/<number of ports> <transport> <fmt list>

     In such a case, the ports used depend on the transport protocol.
     For RTP, only the even ports are used for data and the
     corresponding one-higher odd port is used for RTCP.  For example:

                         m=video 49170/2 RTP/AVP 31

     would specify that ports 49170 and 49171 form one RTP/RTCP pair and
     49172 and 49173 form the second RTP/RTCP pair.  RTP/AVP is the
     transport protocol and 31 is the format (see below).


See if the attached patch fixes your problem.  If it does try opening a
bug report to get it into CVS.


Alex


On Mon, 11 Oct 2004 10:45:10 -0400
"Bill Hamlin" <whamlin at onnet1.com> wrote:

> Well I looked in chan_sip.c and of course there is the line
> 
> if ((sscanf(m, "audio %d RTP/AVP %n", &x, &len) == 1)) {
> 
> where if that were
> 
> if ((sscanf(m, "audio %d/1 RTP/AVP %n", &x, &len) == 1)) {
> 
> it would scan the m= line correctly for me
> 
> Can someone implement the check for both formats and make a patch,
> since I'm no expert on how this CVS stuff works?
> 
> Thanks,
> Bill
> 
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-- 
Alex Zeffertt
Software Engineer
Cambridge Broadband Ltd.
http://www.cambridgebroadband.com
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