19 Apr
2021
19 Apr
'21
9:49 a.m.
Hello NG,
I saw the following threads discussing how to switch to RTP when a client does not support
SRTP.
https://lists.kamailio.org/pipermail/sr-users/2018-May/101341.html
<https://lists.kamailio.org/pipermail/sr-users/2018-May/101341.html>
https://lists.kamailio.org/pipermail/sr-users/2016-September/094457.html
<https://lists.kamailio.org/pipermail/sr-users/2016-September/094457.html>
There are some issues with Zoiper and Bria which also persist in the latest versions. Has
anyone got it work with Zoiper and Bria?
Thanks and regards
Markus
19 Apr
19 Apr
2:35 p.m.
Hi Marcus,
Can't say for Zoiper, but I've worked this case with Counterpath (sadly for
Canada - it is no more, has been acquired by Alianza).
Anyhow, the final conclusion at the time was: *The client is correct to
expect that this is the same INVITE request that took different paths to
the target (as indicated by the different branch IDs) - and thus correct to
reject it with a 482 because the requests are not identical in
content. https://tools.ietf.org/html/rfc3261#section-8.2.2.2
<https://tools.ietf.org/html/rfc3261#section-8.2.2.2> states what should
occur if there is no To tag*
The suggested solutions were:
a) increment CSeq - impossible to do with a proxy
b) send both SAVP and AVP lines in the SDP of the original INVITE. If media
encryption is set to mandatory and SIP TLS is enabled then the SAVP offer
would be accepted. If media encryption is off in Bria, then the AVP offer
would be accepted
Good luck.
On Mon, Apr 19, 2021 at 3:55 AM Markus Bönke <mb(a)tenios.de> wrote:
Hello NG,
I saw the following threads discussing how to switch to RTP when a client
does not support SRTP.
https://lists.kamailio.org/pipermail/sr-users/2018-May/101341.html
https://lists.kamailio.org/pipermail/sr-users/2016-September/094457.html
There are some issues with Zoiper and Bria which also persist in the
latest versions. Has anyone got it work with Zoiper and Bria?
Thanks and regards
Markus
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Kamailio (SER) - Users Mailing List
sr-users(a)lists.kamailio.org
https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
8:13 p.m.
Hello Sergiu,
Thanks for your suggestions. Regarding option b) to put SAVP and AVP, it is not possible
with rtpengine at the moment (see https://github.com/sipwise/rtpengine/issues/435
<https://github.com/sipwise/rtpengine/issues/435>). Also using OSRTP does not work
with Zoiper. The only idea to make it compatible which I have is to add an SRTP/RTP option
to the server-side subscriber configuration. Depending on this setting I can put either
RTP/SAVP or RTP/AVP in the INVITE. The drawback ist that it only works when server and
client configuration is matching.
Thanks and regards
Markus
Am 19.04.2021 um 14:35 schrieb Sergiu Pojoga
<pojogas(a)gmail.com>om>:
Hi Marcus,
Can't say for Zoiper, but I've worked this case with Counterpath (sadly for
Canada - it is no more, has been acquired by Alianza).
Anyhow, the final conclusion at the time was: The client is correct to expect that this
is the same INVITE request that took different paths to the target (as indicated by the
different branch IDs) - and thus correct to reject it with a 482 because the requests are
not identical in content. https://tools.ietf.org/html/rfc3261#section-8.2.2.2
<https://tools.ietf.org/html/rfc3261#section-8.2.2.2> states what should occur if
there is no To tag
The suggested solutions were:
a) increment CSeq - impossible to do with a proxy
b) send both SAVP and AVP lines in the SDP of the original INVITE. If media encryption is
set to mandatory and SIP TLS is enabled then the SAVP offer would be accepted. If media
encryption is off in Bria, then the AVP offer would be accepted
Good luck.
On Mon, Apr 19, 2021 at 3:55 AM Markus Bönke <mb(a)tenios.de
<mailto:mb@tenios.de>> wrote:
Hello NG,
I saw the following threads discussing how to switch to RTP when a client does not
support SRTP.
https://lists.kamailio.org/pipermail/sr-users/2018-May/101341.html
<https://lists.kamailio.org/pipermail/sr-users/2018-May/101341.html>
https://lists.kamailio.org/pipermail/sr-users/2016-September/094457.html
<https://lists.kamailio.org/pipermail/sr-users/2016-September/094457.html>
There are some issues with Zoiper and Bria which also persist in the latest versions. Has
anyone got it work with Zoiper and Bria?
Thanks and regards
Markus
_______________________________________________
Kamailio (SER) - Users Mailing List
sr-users(a)lists.kamailio.org <mailto:sr-users@lists.kamailio.org>
https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
<https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users>
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2 comments
2 participants
participants (2)
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Markus Bönke -
Sergiu Pojoga