Hi

opensips 2.4 and rtpengine.
webrtc SIP clients based on jsSIP 3.3.6
to accounts jssip1 and jssip2

jssip1 calls jssip2 or jssip2 calls jssip1 - call established
jssip1 place call on hold and then unhold - no problem
now if jssip2 place call on hold it receives SIP/2.0 476 Unresolvable destination (476/TM) from opensips and call brakes.
also in opensips.log there are a messages like this:
May 25 02:42:41 opensips-01 /usr/sbin/opensips[19704]: CRITICAL:core:mk_proxy: could not resolve hostname: "djgppiddv7t0.invalid" May 25 02:42:41 opensips-01 /usr/sbin/opensips[19704]: ERROR:tm:uri2proxy: bad host name in URI <sip:[email protected];transport=ws;ob> May 25 02:42:41 opensips-01 /usr/sbin/opensips[19704]: ERROR:tm:t_forward_nonack: failure to add branches

what i found:

While call setup jsip1 sends initial invite:
INVITE sip:[email protected] SIP/2.0
Contact: <sip:[email protected];transport=ws;ob>

server resendsĀ  to jsip2 invite and replaces Contact with the real ip of jsip1:
INVITE sip:[email protected]:49882;transport=ws SIP/2.0
Contact: <sip:[email protected]:46099;transport=ws;ob>


When jssip1 place call on hold or unhold, it sends invite to server with
INVITE sip:[email protected]:51630;transport=ws SIP/2.0
Contact: <sip:[email protected];transport=ws;ob>

server resendsĀ  to jsip2 invite and do not changes Contact:
INVITE sip:[email protected]:51630;transport=ws SIP/2.0
Contact: <sip:[email protected];transport=ws;ob>

Next, when jssip2 places call on hold, it sends invite:
INVITE sip:[email protected];transport=ws;ob SIP/2.0
and server can't resolve djgppiddv7t0.invalid, it expects real address here


does anybody have an idea, who is responsible for the problem - jssip, opensips or rtpengine ?


Laba Mikhail

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