SIP/2.0 485 Ambiguous
Authentication-Info: TLS-DSK qop="auth", opaque="xx", srand="xx", snum="18", rspauth="xx", targetname="xx", realm="SIP Communications Service", version=4
CSeq: 1 INVITE
Via: SIP/2.0/TLS xxx:xx;received=xxx;ms-received-port=xx;ms-received-cid=xx
ms-diagnostics: 4199;reason="Multiple users associated with the target phone number";HRESULT="0x8004C3CD";processing-cluster="xx";processing-frontend="xx";source="xx"
In the enviroment we have a
+1xxxxxxxxx - number of main non-Lync autoattendant. This number does not exist in Lync, but there are several (two) non-DID users with
Even after removing the second user, the error persist. It is strange, since there is no other user or contact or else who use +1xxxxxxxxx - checked with http://blog.codesalot.com/2013/10/07/script-find-cslineuri/
There is some info that it might be a bug of Lync - http://microsofttouch.fr/default/b/christophe/archive/2014/01/01/microsoft-lync-server-2013-erreur-485-ambiguous-call.aspx
I will post update on this....
UPDATE: selected another DID to be used as base for extension and it works ok. Note that there is no direct DID defined in the system, only ones with extensions.
Lync does not like ext to be mixed with no ext. For the example above you have to add ext=1 or any other ext for the main number.