I have a client installation with Lync 2010 and 2013 versions. We are currently in transition to version 2013 only. At the moment mobility records point to the 2013 server and 10% of the users accounts have been moved to the 2013 server as well.
The topology uses a single namespace domain.com both internally and externally. Single consolidated topology with one FE and one Edge server per Lync version. External mobility DNS record is the same as the internal FQDN of the 2003 FE server. Mobility is published via TMG. Lync Edge 2013 is in place and set as associated Edge Pool for both 2010 & 2013 FE servers.
Perhaps the most important driver for the client's decision to move to 2013 is the ability to perform Lync Calls from/to mobile devices.
Calling from Lync Mobile devices to non-mobile devices always succeeds.
Calling from non-mobile devices to mobile devices always fails. The mobile device rings, and once the call is accepted it is sometimes able to send audio, but it never receives audio. After 10-15 seconds the call is dropped and the mobile device Lync client displays the message "The call couldn't be completed. Please try again later"
Running a trace on the server side with OCSLogger produces ALWAYS the following results
- SIP INVITE from non-mobile user to mobile user
- SIP/2.0 100 Trying
- SIP/2.0 403 Forbidden
The 403 Forbidden message has the following details/payload:
TL_INFO(TF_PROTOCOL) [0]0978.3F0C::07/17/2014-10:51:19.215.004aebd2 (S4,SipMessage.DataLoggingHelper:1860.idx(774))[359963683]
>>>>>>>>>>>>Outgoing SipMessage c=[<SipTlsConnection_1033D27>],INTERNAL_IP_OF_FE_SERVER:5088->INTERNAL_IP_OF_FE_SERVER:64914
SIP/2.0 403 Forbidden
FROM: "NON_MOBILE_USER"<sip:NON_MOBILE_USER@domain..com>;tag=7449d62f1a;epid=5f44e18e78
TO: <sip:MOBILE_USER@domain..com>;epid=2161550295;tag=4e2c124121
CSEQ: 1 INVITE
CALL-ID: 97f85a85e38c458c9e369a2cbe35ba92
VIA: SIP/2.0/TLS INTERNAL_IP_OF_FE_SERVER:64914;branch=z9hG4bK94CEAFC7.66866FE0F91A8C07;branched=FALSE,SIP/2.0/TLS 10.50.0.7:64895;branch=z9hG4bK524D40B6.8A2072894438CC04;branched=FALSE;ms-received-port=64895;ms-received-cid=A4F00,SIP/2.0/TLS
10.50.0.16:56180;branch=z9hG4bKE2C1866E.D05C19E8F9199C07;branched=FALSE;ms-received-port=56180;ms-received-cid=5B0CA00,SIP/2.0/TLS 10.50.0.17:50047;branch=z9hG4bKE3B06764.B15E774C465AEC1B;branched=FALSE;ms-received-port=50047;ms-received-cid=105C00,SIP/2.0/TLS
10.10.10.169:62824;received=10.50.15.1;ms-received-port=62824;ms-received-cid=3B1F00
CONTENT-LENGTH: 0
SERVER: RTCC/5.0.0.0 UCWA/5.0.0.0
ms-diagnostics: 24118;Component="RTCC/5.0.0.0_UCWA/5.0.0.0";Reason="Application accepts invitations via static registration only.";Source="2013_FE_SERVER.domain.com"
------------EndOfOutgoing SipMessage