11-10-2011 03:34 PM - edited 03-17-2019 10:36 PM
We have a strange issue when trunking between CUCM and VCS.
We have a cluster of CUCM's trunking to a single VCS. SCCP Phones registered to CUCM Subscriber 1 can call VCS endpoints fine but phones registered to subscriber 2 can't (it connects for a second but then disconnects). Internally to CUCM, all calls work OK.
VCS has a SIP peer with both subscribers in the same zone.
Usually for VCS to CUCM problems I would look at SIP profiles etc, but seeing as all phones are using the same trunk (with the same SIP settings) it doesn't seem that this is an issue. Could it be something to do with services running on Subscriber 2, or media resources?
The only difference in configuration between phones that work and don't work is the CUCM group which dictates which CUCM they subscribe to - all other settings are identical.
I'm using CUCM 8.6 and VCS 5.1. I know that I should upgrade VCS (and I will soon) but seeing as it works to one of my subscribers and not the other, I don't think this is the issue.
11-16-2011 12:31 PM
Hello,
•SIP 1xx—Informational Responses
•SIP 2xx—Successful Responses
•SIP 3xx—Redirection Responses
•SIP 4xx—Client Failure Responses
•SIP 5xx—Server Failure Responses
•SIP 6xx—Global Failure Responses
A full list of SIP codes may be found here:
If you have little experience reading logs you may want to use the Voice Log Translator (VLC) tool.
http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cvlt/2_7/english/user/guide/vlt277.html
Has this configuration ever worked?
11-16-2011 01:03 PM
They are definitely using the same Calling Search Spaces etc. The only difference between the phones is the CUCM group, all other settings are identical (I made a new Device pool with new CUCM group especially to test this).
I should also note that it seems to connect for a second then drop.
11-17-2011 08:42 AM
Have you collected the sip traces from ucm and the vcs?
11-17-2011 01:44 PM
Update: We got it working (Well, it just started working on it's own).
I suspect the issue was with the subscriber itself as it seemed to be doing some other funny things also.
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