[asterisk-users] PRI Crapping Out Regularly

[George Pajari]

We have a server with a TE120 on a partial PRI trunk that several times 
a day declares the PRI trunk down and stops handling calls until the 
asterisk is stopped, the zaptel/te120 modules reloaded, and asterisk 
started.

Just before things go down, the log shows the following error:

ERROR[9424] chan_zap.c: Write to 28 failed: Unknown error 500

at which point a "show pri spans" reports "PRI span 1/0: Provisioned, 
Down, Active" and a "pri show span 1" reports:

Primary D-channel: 24
Status: Provisioned, Down, Active
Switchtype: National ISDN
Type: CPE
Window Length: 0/7
Sentrej: 0
SolicitFbit: 0
Retrans: 0
Busy: 0
Overlap Dial: 0
T200 Timer: 1000
T203 Timer: 10000
T305 Timer: 30000
T308 Timer: 4000
T309 Timer: -1
T313 Timer: 4000
N200 Counter: 3


(a) What is causing this?
(b) How can it be fixed?
(c) Why does Asterisk not recover automatically to what appears to be an 
intermittent problem?

-- 
George Pajari (dCAP), netVOICE communications 604 484 VOIP(8647) x102
   www.netvoice.ca  www.ip-centrex.ca  www.ip-pbx.ca  www.vpas.ca
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Open Source VoIP/Telephony Specialists  1 877 NET VOIP (638 8647 x102)