I had the same issue on a 2621, spoke to TAC and they informed that it was a caveat that is resolved in a later version. Once we upgraded the IOS, all was fine. I can't remember the version it was resolved in, but at the time we upgraded to 12.2(7) and it worked fine thereafter (Cisco pulled that particular version off the website after a couple of months so we upgraded to 12.2(10a) which seems to be working fine as well. Hope this helps.
"no ip route-cache" on WAN interfaces solved DSP timeout issue but still had major problems with calls. The bottom line is that 12.2.2XN is buggy code. There is not another revision that works with PRI on a VG200 available. MGCP on VG200 with PRI is not ready for prime time. Use H323.
I had the similiar problem with VG200, 12.2.2XN configured for MGCP. The problems were that DSP timeout, unavailable, and high pitched scratchy noise, and the VG200's would unregister themself from time to time. I worked with three TAC engineers on those issues. They finally were able to duplicate the issues. They told me that no good code for MGCP on VG is available now. I switched over to H.323 without any issues ever since.
Currently Cisco has two bugs that may be attributing to your problem of dsp timeouts.
Because the timeouts are very intermittant, it will be hard to prove.
The two bug IDs are listed below:
> CSCdu53333 (dsp crashes / 30sec / 60 min to recovery)
> CSCdv81608 (dsp enters domant stage and will not answer calls)
These bugs can be found in 12.2, but it could be applicable to 12.1 as well
In general, < show voice port > and < show voice dsp > are good commands that will give great deal of usable information as well as the < show tech >; < test dsp > may or may not work. The CLI is just there in VG200s. It works on PRI interfaces and E&M ports (not 100% sure about E&M).
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.