I recently resurrected an old athlon system and put CentOS 4.2 on
it to play with asterisk. First I tried asterisk-1.0.9, now I'm using
1.2.0-b2. Both have the same audio issues that have me stumped.
I looked through all the lists and forums and the closest I could
get were some messages from 2003:
http://lists.digium.com/pipermail/asterisk-users/2003-August/017171.html
I've got asterisk set up with my xten-lite softphone on extension
200 over SIP. I've configured extension 611 as an echo test and 612 will
play 30 seconds of MusicOnHold. I can connect to both just fine, however,
they sound rather bad when they work (quite muddy) and periodically they
just drop out for as much as 5 seconds before coming back.
Enabling all the debugging and verbosity options, I've found a few
messages that occur during each drop. During the MOH run, every time
there's a drop, the console scrolls:
res_musiconhold.c:535 monmp3thread: Only wrote -1 of 640 bytes to pipe
over and over until the sound comes back, at which point, the console
message:
rtp.c:1247 ast_rtp_raw_write: Difference is 33824, ms is 4248
is displayed. (Not always the same numbers in that one, obviously)
In the echo test, again, after a drop, the audio returns and a
message similar to:
rtp.c:1247 ast_rtp_raw_write: Difference is 12496, ms is 1582
is displayed.
The asterisk server is on a single Athlon MP 1600+ (1.4GHz) with
512MB of RAM. It's got a K7D-Master mobo, and is connected to the system
running the softphone through a 100Mbit LAN.
I've not enabled any of the MMX optimizations as there were
warnings that they didn't play nice with AMD chips.
If there's any further info I can provide, I'd be happy to.
Thanks,
Chris
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