[asterisk-users] Maximum number of PRI calls on 1 asterisk box (no HW echo)

[James Lamanna]

Hi,
Does anyone have any good empirical data suggesting what the maximum
number of PRI calls (incoming and outgoing)
without hardware echo cancellation can be handled on a single box is?
I have a TE410P T1 (1st gen) card and I'm seeing interesting errors of
D-Channels going down and then coming back up (See below).

I've looked at the number of simultaneous calls at each of these
points, and each time the span seems to
have around 21-23 calls, and the total number of calls ranges between 47 and 53.
I'm trying to figure out if this is a load issue or an issue on the
provider side, though my provider says they
do not see any errors on any of the T1s.
Could this be some sort of hardware interrupt problem? If so, how can I check?

The specs of the machine are, Dual Xeon 2.80Ghz (both single core but w/HT)
4GB memory.
Running asterisk 1.4.26.3 (32-bit)
with libpri-1.4.7 and zaptel-1.4.12.9

Thanks.

-- James

Please CC me on responses.


[Mar 22 09:45:00] VERBOSE[8887] logger.c:   == Primary D-Channel on span 2 down
[Mar 22 09:45:00] WARNING[8887] chan_dahdi.c: No D-channels available!
 Using Primary channel 48 as D-channel anyway!
[Mar 22 09:45:00] VERBOSE[8887] logger.c:   == Primary D-Channel on span 2 up
[Mar 22 09:59:23] VERBOSE[8886] logger.c:   == Primary D-Channel on span 1 down
[Mar 22 09:59:23] WARNING[8886] chan_dahdi.c: No D-channels available!
 Using Primary channel 24 as D-channel anyway!
[Mar 22 09:59:23] VERBOSE[8886] logger.c:   == Primary D-Channel on span 1 up
[Mar 22 09:59:23] VERBOSE[8886] logger.c:   == Primary D-Channel on span 1 down
[Mar 22 09:59:23] WARNING[8886] chan_dahdi.c: No D-channels available!
 Using Primary channel 24 as D-channel anyway!
[Mar 22 09:59:23] VERBOSE[8886] logger.c:   == Primary D-Channel on span 1 up
[Mar 22 10:36:11] VERBOSE[8886] logger.c:   == Primary D-Channel on span 1 down
[Mar 22 10:36:11] WARNING[8886] chan_dahdi.c: No D-channels available!
 Using Primary channel 24 as D-channel anyway!
[Mar 22 10:36:11] VERBOSE[8886] logger.c:   == Primary D-Channel on span 1 up
[Mar 22 10:36:11] VERBOSE[8886] logger.c:   == Primary D-Channel on span 1 down
[Mar 22 10:36:11] WARNING[8886] chan_dahdi.c: No D-channels available!
 Using Primary channel 24 as D-channel anyway!
[Mar 22 10:36:11] VERBOSE[8886] logger.c:   == Primary D-Channel on span 1 up
[Mar 22 10:44:36] NOTICE[8888] chan_dahdi.c: PRI got event: HDLC Bad
FCS (8) on Primary D-channel of span 3
[Mar 22 10:45:44] NOTICE[8886] chan_dahdi.c: PRI got event: HDLC Bad
FCS (8) on Primary D-channel of span 1
[Mar 22 10:59:33] NOTICE[8887] chan_dahdi.c: PRI got event: HDLC Abort
(6) on Primary D-channel of span 2
[Mar 22 11:30:53] VERBOSE[8886] logger.c:   == Primary D-Channel on span 1 down
[Mar 22 11:30:53] WARNING[8886] chan_dahdi.c: No D-channels available!
 Using Primary channel 24 as D-channel anyway!
[Mar 22 11:30:53] VERBOSE[8886] logger.c:   == Primary D-Channel on span 1 up
[Mar 22 15:34:28] VERBOSE[8887] logger.c:   == Primary D-Channel on span 2 down
[Mar 22 15:34:28] WARNING[8887] chan_dahdi.c: No D-channels available!
 Using Primary channel 48 as D-channel anyway!
[Mar 22 15:34:28] VERBOSE[8887] logger.c:   == Primary D-Channel on span 2 up