I have an Asterisk server connected to a SIP trunk provider which has been running fine. We were developing code for the Digium Fax for Asterisk product and needed T38 support. We performed the upgrade on the Ubuntu Linux based server without any issues except modules. We moved all our existing modules to a backup folder and were able to get all our dialplans and applications running.
However, we suddenly now have voice quality issues on any voice file played. This includes our own recorded files, and the voice files which are included with asterisk.
I have monitored the server with the Linux top utility and cpu usage is not spiking, memory usage is not spiking. I have no idea what significant change is causing this problem but I could use any input or help that can be provided.
I see no errors or other issues in the SIP traffic or from Asterisk in my test or production code, but the voice quality issue is always there.
Please help. Thank you in advance,