apilamiento de llamadas a2billing

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Hola

Les escribo porque tengo el siguiente problema. Hasta hace 2 meses mi server con a2billing estaba trabajando bien, pero ahora sufre de apilamientos de llamadas, es decir un monton de llamadas salientes en quedan en RINGING. Lo que he visto es q las solicitudes de llamadas llegan hasta:

-- Executing [074233334@a2billing:1] DeadAGI("SIP/xxxxx-096e6290", "a2billing.php|1") in new stack
[2011-08-24 13:27:55] WARNING[20082]: res_agi.c:2129 deadagi_exec: Running DeadAGI on a live channel will cause problems, please use AGI
-- Launched AGI Script /var/lib/asterisk/agi-bin/a2billing.php

Ahi se quedan las llamadas, y se acumulan por varios minutos, y ninguna timbra, el fono se queda mudo. Cuando sucede eso, tambien la interfase web, ya sea la del administrador y la de clientes, se queda colgada. Cuando las lamadas comienzan a pasar, luego del congestionamiento en el asterisk, las interfases pueden funcionar con normailidad.

Aqui le muestro como se apilan las llamadas:

-- Executing [074233334@a2billing:1] DeadAGI("SIP/xxxxx-096e6290", "a2billing.php|1") in new stack
[2011-08-24 13:27:55] WARNING[20082]: res_agi.c:2129 deadagi_exec: Running DeadAGI on a live channel will cause problems, please use AGI
-- Launched AGI Script /var/lib/asterisk/agi-bin/a2billing.php
-- Executing [945735876@a2billing:1] DeadAGI("SIP/xxxxx-0969ebf8", "a2billing.php|1") in new stack
[2011-08-24 13:27:56] WARNING[20085]: res_agi.c:2129 deadagi_exec: Running DeadAGI on a live channel will cause problems, please use AGI
-- Launched AGI Script /var/lib/asterisk/agi-bin/a2billing.php
-- Executing [999991246@a2billing:1] DeadAGI("SIP/xxxxx-0964d9b0", "a2billing.php|1") in new stack
[2011-08-24 13:28:00] WARNING[20100]: res_agi.c:2129 deadagi_exec: Running DeadAGI on a live channel will cause problems, please use AGI
-- Launched AGI Script /var/lib/asterisk/agi-bin/a2billing.php
-- Hungup 'Zap/14-1'annels
-- Executing [0034692590476@a2billing:1] DeadAGI("SIP/xxxxx-095d2598", "a2billing.php|1") in new stack
[2011-08-24 13:28:11] WARNING[20140]: res_agi.c:2129 deadagi_exec: Running DeadAGI on a live channel will cause problems, please use AGI
-- Launched AGI Script /var/lib/asterisk/agi-bin/a2billing.php
-- Executing [950430584@a2billing:1] DeadAGI("SIP/xxxxx-09621178", "a2billing.php|1") in new stack
[2011-08-24 13:28:13] WARNING[20142]: res_agi.c:2129 deadagi_exec: Running DeadAGI on a live channel will cause problems, please use AGI
-- Launched AGI Script /var/lib/asterisk/agi-bin/a2billing.php
-- AGI Script Executing Application: (Dial) Options: (zap/r0/074233334|32|HL(29880000:61000:00000))
-- Limit Data for this call:
> timelimit = 29880000
> play_warning = 61000
> play_to_caller = yes
> play_to_callee = no
> warning_freq = 0
> start_sound = (null)
> warning_sound = timeleft
> end_sound = (null)
-- Requested transfer capability: 0x00 - SPEECH
-- Called r0/074233334
-- Zap/19-1 is proceeding passing it to SIP/4466214882-096e6290
-- AGI Script a2billing.php completed, returning 0
-- Zap/19-1 is ringingnels
PBX-agarcia*CLI> show channels
Channel Location State Application(Data)
Zap/19-1 074233334@from-pstn: Ringing AppDial((Outgoing Line))
SIP/xxxxx-09621 950430584@a2billing: Ring DeadAGI(a2billing.php|1)
SIP/xxxxx-095d2 0034692590476@a2bill Ring DeadAGI(a2billing.php|1)
SIP/xxxxx-0964d 999991246@a2billing: Ring DeadAGI(a2billing.php|1)
SIP/xxxxx-0969e 945735876@a2billing: Ring DeadAGI(a2billing.php|1)
SIP/xxxxx-096e6 074233334@a2billing: Ring Dial(zap/r0/074233334|32|HL(29
SIP/xxxxx-097df 005786651498@a2billi Ring DeadAGI(a2billing.php|1)
SIP/xxxxx-095eb 0059176334708@a2bill Ring DeadAGI(a2billing.php|1)
Zap/18-1 (None) Up Bridged Call(SIP/7937085299-09
SIP/xxxxx-095e3 5563521@a2billing:1 Up Dial(zap/r0/5563521|32|HL(1116
SIP/xxxx-09622bc8 (None) Up Bridged Call(SIP/2457627607-09
SIP/xxxxx-0964f 971939399@a2billing: Up Dial(SIP/2010/971939399|32|HL(
SIP/xxxx-09761b48 (None) Up Bridged Call(SIP/7260763792-09
SIP/xxxxxx-09524 945803002@a2billing: Up Dial(SIP/2010/945803002|32|HL(
SIP/xxxx-09523038 (None) Up Bridged Call(SIP/1654090896-09
SIP/xxxxx-095e5 9 97487869@a2billing: Up Dial(sip/3010/997487869|32|HL(
SIP/xxxxx-09713 00551164452714@a2bil Up DeadAGI(a2billing.php|1)
Zap/29-1 (None) Up Bridged Call(SIP/7933445933-09
SIP/xxxxx-096a0 5263311@a2billing:1 Up Dial(zap/r0/5263311|32|HL(2856
19 active channels
13 active calls

saludos..., espero puedan ayudarme

cuento con centos 5.2 , asterisk 1.4.21.1 y a2billing 1.3.3