Ross Beer wrote:
Hi Dev,
In Asterisk 1.8 Snom phones accept calls when RTP/SAVP is set to
'mandatory' which means that the RTP/SAVP options appear in the SDP 'm'
lines. However in Asterisk 13 chan_pjsip, no such lines exist when using
'SDES' encryption.
The "media_encryption=sdes" option turns on SRTP support and thus makes
the media RTP/SAVP. You can also turn on optimistic SRTP support as well
using "media_encryption_optimistic=yes" which will use RTP/AVP but
include a crypto line. I just checked the testsuite tests for SDP
offer/answer and they are passing, I also manually enabled it and
confirmed it is RTP/SAVP. You may have a configuration error.
Therefore Snom phones require this option to be set to 'off'. Should
Asterisk 13 be offering RTP/SAVP in the same way as chan_sip did?
With regards to TLS, devices reject calls if a 'transport=transport-tls'
is specified. Is this also a bug as it appears that Asterisk doesn't
re-use an active connection in this situation?
This is a bug in PJSIP which has an issue on our side[1]. If an explicit
transport is specified PJSIP will not reuse a connection.
[1] https://issues.asterisk.org/jira/browse/ASTERISK-22658
--
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org
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