Cisco Cisco TelePresence Video Communication Server Expressway
Appendix 1 – Troubleshooting
Cisco VCS Deployment Guide: Microsoft OCS 2007 R2, Lync 2010 and Cisco VCS X7.0
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MOC/Lync clients try to register with VCS Expressway
SIP video endpoints usually use DNS SRV records:
_sips._tcp.<domain>
_sip._tcp.<domain> and
_sip._udp.<domain>
in that order to route calls to Cisco VCS.
MOC/Lync clients use:
_sipinternaltls._tcp.<domain>
- for internal TLS connections
_sipinternal._tcp. <domain>
- for internal TCP connections (only if TCP is allowed)
_sip._tls. <domain>
- for external TLS connections
_sip._tcp.<domain>
- for external TCP connections (MOC R1 only)
_sip._tcp.<domain> is common to both when MOC R1 is used on an external network. From R2
MOC/Lync clients only support TLS connection to the Edge Server. The _sip._tcp.<domain> DNS
SRV record should be used for the Cisco VCS Expressway.
MOC/Lync clients only support TLS connection to the Edge Server. The _sip._tcp.<domain> DNS
SRV record should be used for the Cisco VCS Expressway.
B2BUA problems
B2BUA registration problems users fail to register
If B2BUA registration fails to register FindMe users (Registration status = failed), check:
1. The FindMe name is correctly entered into Active Directory.
2. A MOC/Lync client can register as the FindMe name – you need to login first from a MOC/Lync
client before the B2BUA can properly control the OCS/Lync user.
OCS/Lync problems
As a starting point
for OCS: running the OCS ‘Best Practices Analyzer’ will help identify configurations that may be
incorrect on OCS. Details and the download can be found at:
incorrect on OCS. Details and the download can be found at:
for Lync: running the Lync Server 2010 ‘Best Practices Analyzer’ will help identify configurations
that may be incorrect on Lync Server. Details and the download can be found at:
that may be incorrect on Lync Server. Details and the download can be found at:
OCS running on Microsoft Server 2008 R2
Operation of TLS has been changed in this version of Server software – this version is not
recommended for use with OCS. This version of operating system may be used with Lync.
recommended for use with OCS. This version of operating system may be used with Lync.
Problems with certificates
If a non-OCS/Lync application is used to create certificates to load onto Cisco VCS for use with
OCS/Lync (e.g. purchased from a certificate authority) it is vital that the Subject name and Subject
Alternate Name contain the same details as they would if the certificates were created by OCS/Lync.
OCS/Lync (e.g. purchased from a certificate authority) it is vital that the Subject name and Subject
Alternate Name contain the same details as they would if the certificates were created by OCS/Lync.