Cisco Cisco TelePresence Video Communication Server Expressway
TLS calls fail when Unified CM uses SRV trunk destinations
Calls from Unified CM may fail if they use a TLS trunk security profile and SRV trunk destinations (requiring
"_sips._tcp" SRV record lookups in DNS).
"_sips._tcp" SRV record lookups in DNS).
See bug CSCue37440 in the
for up-to-date information regarding the versions of
Unified CM in which this issue has been fixed.
If you need to address one or more VCS peers you can work around this problem by not using SRV records.
Instead, in the SIP trunk, specify each VCS Destination Address individually using DNS A-records or
static IP addresses. However, note that these addresses affect the domain portion of the URI received by
VCS from Unified CM. You may need to set up appropriate transforms on the VCS to cater for this (see
Instead, in the SIP trunk, specify each VCS Destination Address individually using DNS A-records or
static IP addresses. However, note that these addresses affect the domain portion of the URI received by
VCS from Unified CM. You may need to set up appropriate transforms on the VCS to cater for this (see
).
Unified CM with Cisco VCS (SIP Trunk) Deployment Guide (X7.2)
Page 36 of 49
Appendix 1 – Troubleshooting