%C5510-1-NO_RING_DESCRIPTORS, 2851 router DSP error

[BALAMURUGAN SINGARAM]

We are getting the below error "%C5510-1-NO_RING_DESCRIPTORS" and isdn channels goes up/down, the Voice gateway is working for the past 3 years without any issuse ?.

Please light me the issuse is because of PVDM or we need to upgarde IOS, the current IOS is 12.14(15).

[Chris Deren]

Did you see this:

https://supportforums.cisco.com/docs/DOC-3194

[Chris Deren]

Another matching bug:

CSCsr56105

Symptoms: A Cisco IOS VoIP gateway may experience audio issues such as  dead- air or one-way audio for VoIP call present on the gateway. When  this occurs, the following error message will be displayed on the  gateway: %C5510-1-NO_RING_DESCRIPTORS: No more ring descriptors  available

Conditions: The symptom is observed on a Cisco 2801 VoIP gateway that is  running Cisco IOS Release 12.4(20)T or Release 12.4(15)XZ1.

Workaround: There is no known workaround to prevent this issue while  using Cisco IOS Release 12.4(20)T or 12.4(15)XZ1 while using the Cisco  2801 router. Use an earlier release to avoid this issue.

[BALAMURUGAN SINGARAM]

The voice router has been working perfectely for the past 3 years, from today moring it has  the above issuse. Current IOS version 12.4(14)T.

It is becuase of IOS or the DSP [ hardware itself ] ?