Analog Phones & "Device Is Not Trusted"

Unanswered Question
Jul 27th, 2010

We upgraded our CUCM from version 6 to 7.1.3 and have come across a number of issues with analog phones and faxes unregistering from call manager and requiring voice-port shut-no shuts to register properly.  We're trying to narrow the problem down and ensured that the sccp identifiers on the MGCP  VG224's and 3845's are now pointed to version 7.0.  However, we're receiving the "Device Is Not Trusted" warning on these gateways in CUCM as well as the analog phones connected to them.  Is there a way of debugging why a gateway is not trusted and would this problem cause analog phones to unregister with CUCM (seeminly at random)?  Perhaps this is a bug that has been fixed in a later version of CUCM?

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fleming-j Thu, 01/27/2011 - 07:49

We recently upgraded from CUCM 6.1.5 to 7.1.5 and experienced this same ‘not trusted’ issue.  I found this post and was surprised no one replied to it. 


Here's the deal... In CUCM 7.1.3 there were 'security features' added.

The configured CallManager servers on the router have to match the CallManager’s in the ‘callmanager group’ associated to the ‘device pool’ that the gateway is using.


This 'security feature' impacted our Unity communications, Voice Analog Gateways, and H323 Gateways.  TAC resolved the issue with Unity and from there we used that information to correct our problem on our Voice Analog Gateways(VG224).

The H323 gateways were a different problem and TAC was unable to offer a solution besides upgrade the code (no offense TAC guys you’re the best).  To resolve the issue we converted the gateways from H.323 to MGCP.



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