Intermittant no Dial tone on First line of IP phone in CME 4.1

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Jun 7th, 2010
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Hello all,

     I am having a strange issue with CME 4.1.  Intermittantly when users press button 1 or pickup the handset on their IP phones (7941's and 7961's), their is no dial tone.  If a call comes into the phone for button 1 it is forwarded to button 2 (this is intended if button one is busy).  According to my customer the only way that they have been able to clear this issue is to reboot the CME router.  They also state that this happens to multiple users about once per month.  Any Ideas?  Thanks!!

Shawn C. Smith

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Walter Solano Mon, 06/07/2010 - 18:38
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Hello Shawn,

This issue could be cause by a High CPU utilization in the router, this could be cause by a memory leak, a bug in the IOs, or high utilization of the CME router.

Please check the "Show proc CPU" if you see a high CPU case, reload the router and monitor the system for a couple of days to discard a memory leak.


Please rate this post if was helpful

Walter Solano

Cisco UCCX Specialist

Shawn Smith Tue, 06/08/2010 - 11:33
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Thanks Walter,

     I issued the sh proc cpu command and found that my max cpu load was consistantly under 5% (not a very large customer).  Thanks for the info though.


Shawn Smith Tue, 06/08/2010 - 12:53
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     I have found that my issue is really with ephone-dn's becoming locked up in the system.  I have found Cisco bug CSCtc01185 that addresses this problem.  Thanks for everyones assistance!

Shawn C. Smith


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