I am having almost the exact same problem. I have the following setup:
Debian Woody Kernel 2.4.18
CPU: P4 1.2GHz
RAM: 1GB
Asterisk – Latest CVS
1 TDM400P card
Codec GSM
I’ve been chasing down bandwidth issues, but have had no luck. We are still pursuing those issues.
I just started configuring IAX, so I assumed it was related to my IAX configs. We just noticed this morning that SIP is having the same issue, but that it isn’t as severe.
We are sending our calls over the regular Internet, but that hasn’t been a problem in the past. Besides the problem is too regular to be Internet related (unless it is at my service provider).
Regards,
John
