You have to look trough the detailed trace files. It could be that there were no more transcoder resources available (if any are configured.) Do you have multiple codecs in your network? Transcoders and MTPs are closely related. Only looking at the trace files will tell you what failed to allocate.
There's also PERFMON statistics you can look at. If they are all reading 0 and you are getting your error, then it's probably transcoding.
Verify you have your MRG and MRGLs configured correctly.
Hi, also have what kind of problem. Did you fix it? In system where are different codecs but maybe problem is then calls go through pgw and call goes in 3.1 kHz. Trace files shows nofing intresting only mtp timecheck and timeout.
This most likely means that the MTP resources that exist within the CallManager are already assigned to some other Media Resource Group which should be in use by some other devices.
What I am recommending you, is to make sure whether there are any MRGs taking already this MTP resources, and if so, assign the same MRGL to this other devices with the problem, or create similar MRG and MRGL, using the same or similar resources, but including some MTP resources, and assign them to the devices with the problem.
If the devices or the Device Pool to which they belong do not have any MRGL configured, it will be likely to present such or similar problems.
If you configured a MRGL which is not assigned to a device pool,this DP can not make use of the MRGL
The way to solve it would be to assign that same MRGL to all of the Device Pools and reset them, then the resources will be available for everybody.
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