I got one side of call-leg from your description, but what is complete e2e call flow?
++ From the packet capture it looks like protocol based T38, but We dont support protocol based t38 in SCCP, only NSE based T38 swicthover is supported in sccp. If by anyhance CCM is talking sccp to far end device which is connected to fax machine, then you would see 488 media error.
++ Or other suspect is MTP invoked in the call flow, which is not configured for codec passthrough.
Please check the above two possibilities, if not please collect the detailed CCM traces with the calling details and pass it to us.
The problem is solved "by itself", but I see that something changed from the operator side. I think that they changed something and they rolled back now and is working again so it was not a problem on the Cisco network side.
Thank you for the ATA information, will be useful for future troubleshooting!
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...