So I migrated the system to a whole new platform using PBX in a Flash, everything is compiled from source:
* Asterisk Source Version : 1.4.21.2
* Zaptel Source Version : 1.4.12.1
* Libpri Source Version : 1.4.9
* Addons Source Version : 1.4.7
CentOS release 5.2 (Final) :32 Bit Kernel: 2.6.18-92.1.22.el5
I have made no modifications to zaptel other than what is instructed for the opvxa1200 module, it is running the standard MG2 echo canceler.
I ran zttest, after 100 passes it was still 99.96 at the worst, below is more:
--- Results after 1206 passes ---
Best: 100.000 -- Worst: 99.680 -- Average: 99.996785, Difference: 99.997571
What happens is the inside caller hears a scratching noise when he talks, the other person on the caller does not hear any problems, the call is perfectly clear for them. The noise is usually for the first 3-5 seconds of when the person talks, then it goes away.
messages log shows no lost interrupts. I have tested SIP trunks also and all SIP calls are fine, only calls through the fxo channels are scratchy.
these are the only sync messages, but there are calls every minute that get bad voice problems, maybe 300-400 calls per day.
$ cat /var/log/messages |grep buffer
Mar 3 04:46:19 pbx kernel: buffer sync misseed!
Mar 3 04:46:19 pbx kernel: buffer re-sync occur from -1 to 3
Mar 3 05:30:02 pbx kernel: buffer sync misseed!
Mar 3 05:30:02 pbx kernel: buffer re-sync occur from -1 to 3
i] Last edited by jahyde at 2009-3-4 08:22 [/i