[asterisk-users] PRI error cause hangup calls

[voip crazy]

Dear all,

When I make a call using my PRI line, all goes well, but suddently the
call hangs up.
I searched the asterisk logs, and I found that.

Write to 55 failed: Unknown error 500
Short write: 0/15 (Unknown error 500)

What does this mean?
Why this occurs?
How could I solve that?

Someone could tell me if it was a primary error (the primary shows red
alert in all its channels) or it could be a driver or config problem?

Thanks in advance.

VoipCrazy.

Mar 27 14:28:00 DEBUG[20313] chan_zap.c: Got event Alarm(4) on channel
1 (index 0)
Mar 27 14:28:00 VERBOSE[20313] logger.c: Write to 55 failed: Unknown error 500
Mar 27 14:28:00 VERBOSE[20313] logger.c: Short write: 0/15 (Unknown error 500)
Mar 27 14:28:00 WARNING[20313] chan_zap.c: Detected alarm on channel
1: Red Alarm
Mar 27 14:28:00 DEBUG[20313] chan_zap.c: disabled echo cancellation on channel 1
Mar 27 14:28:00 DEBUG[20313] channel.c: Didn't get a frame from channel: Zap/1-1
Mar 27 14:28:00 DEBUG[20313] channel.c: Bridge stops bridging channels
SIP/7008-b6a158e0 and Zap/1-1
Mar 27 14:28:00 DEBUG[20313] chan_zap.c: Set option AUDIO MODE, value:
ON(1) on Zap/1-1
Mar 27 14:28:00 DEBUG[20313] chan_zap.c: Hangup: channel: 1 index = 0,
normal = 36, callwait = -1, thirdcall = -1
Mar 27 14:28:00 DEBUG[20313] chan_zap.c: disabled echo cancellation on channel 1
Mar 27 14:28:00 DEBUG[20313] chan_zap.c: Set option TDD MODE, value:
OFF(0) on Zap/1-1
Mar 27 14:28:00 DEBUG[20313] chan_zap.c: Updated conferencing on 1,
with 0 conference users
Mar 27 14:28:00 DEBUG[20313] chan_zap.c: Set option AUDIO MODE, value:
OFF(0) on Zap/1-1
Mar 27 14:28:00 DEBUG[20313] chan_zap.c: disabled echo cancellation on channel 1
Mar 27 14:28:00 VERBOSE[20313] logger.c:     -- Hungup 'Zap/1-1'
Mar 27 14:28:00 DEBUG[20313] app_dial.c: Exiting with DIALSTATUS=ANSWER.
Mar 27 14:28:00 VERBOSE[20313] logger.c:   == Spawn extension
(macro-dialout-trunk, s, 20) exited non-zero on 'SIP/7008-b6a158e0' in
macro 'dialout-trunk'
Mar 27 14:28:00 VERBOSE[20313] logger.c:   == Spawn extension
(macro-dialout-trunk, s, 20) exited non-zero on 'SIP/7008-b6a158e0'
Mar 27 14:28:00 VERBOSE[20313] logger.c:     -- Executing
Macro("SIP/7008-b6a158e0", "hangupcall") in new stack
Mar 27 14:28:00 VERBOSE[20313] logger.c:     -- Executing
ResetCDR("SIP/7008-b6a158e0", "w") in new stack
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel 2:
Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 2
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel 3: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 3
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel 4: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 4
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel 5: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 5
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel 6: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 6
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel 7: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 7
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel 8: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 8
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel 9: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 9
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel
10: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 10
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel
11: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 11
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel
12: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 12
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel
13: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 13
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel
14: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 14
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel
15: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 15
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel
17: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 17
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel
18: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 18
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel
19: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 19
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Detected alarm on channel
20: Red Alarm
Mar 27 14:28:00 WARNING[5155] chan_zap.c: Unable to disable echo
cancellation on channel 20
Mar 27 14:28:00 NOTICE[5154] chan_zap.c: PRI got event: Alarm (4) on
Primary D-channel of span 1
Mar 27 14:28:00 WARNING[5154] chan_zap.c: No D-channels available!
Using Primary channel 16 as D-channel anyway!