Cisco Cisco TelePresence Video Communication Server Expressway
6. Select the following:
l
Products = UCM
l
Services = Cisco CallManager
l
Trace File Type = sdi
7. Click Finish.
Note:
n
Logs can take a while to download.
n
The sdi (System Diagnostic Interface) trace contains alarms, error information and SIP stack trace
information.
information.
Call failures
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).
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
).
Encrypted call failures
Calls between endpoints registered to Unified CM and endpoints registered to VCS (or proxied via VCS) will
fail if the Unified CM endpoint requests best effort encryption and the other endpoint does not support
encryption. (Unified CM has a proprietary method for indicating fall back to no encryption - X-cisco-srtp-
fallback – which VCS currently does not support.)
fail if the Unified CM endpoint requests best effort encryption and the other endpoint does not support
encryption. (Unified CM has a proprietary method for indicating fall back to no encryption - X-cisco-srtp-
fallback – which VCS currently does not support.)
Cisco Unified Communications Manager with Cisco VCS (SIP Trunk) Deployment Guide (X8.6)
Page 33 of 43
Appendix 1: Troubleshooting