Hi team,
This is a Lync 2010 environment. Federation is done with 7 orgs. 6 of them are working fine. however, with one federated partner, we are having issues with audio/video calls. when ever a call is made, it's getting dropped and the below error is generated from client end.
SIP/2.0 481 Call Leg/Transaction Does Not Exist
Ms-client-diagnostics: 52085;reason="Dialog does not exist"
Proxy-Authorization: TLS-DSK qop="auth", realm="SIP Communications Service", opaque="5BB4331A", targetname="<FrontEndFQDN>", crand="0594e527", cnum="25", response="ba0cbdf773f7bdc6725d9b689e9eaf75cb6c6bd2"
I'm wondering why calls are failing with this account only.
Thank you.
Chris.