внезапно 480 Temporarily Unavailable [Call preocessing released] [закрыт]

Внезапно возникла проблема с мультифоном, входящие звонки приходят, но вот исходящие через очередь к сожалению нет, в логах пишет следующее:

 -- Executing [s@dialnummaster_queue:6] Queue("SIP/multifon-00000036", "queue-multifon") in new stack -- Started music on hold, class 'default', on SIP/multifon-00000036 == Using SIP RTP CoS mark 5 -- Got SIP response 480 "Temporarily Unavailable [Call processing released]" back from 193.201.229.35:5060 -- SIP/multifon-00000037 is circuit-busy -- Nobody picked up in 9000 ms 

настройки в sip.conf

[general] useragent=Linksys/SPA8000-5.1.10 sdpsession=Linksys SPA8000-5.1.10 tcpenable=yes disallow=all allow=alaw allow=ulaw register=>mydearuser@multifon.ru:mysuperpass:mydearuser@sbc.megafon.ru:5060/mydearuser alwaysauthreject=yes allowguest=no [multifon] dtmfmode=inband username=mydearuser type=peer secret=mysuperpass host=sbc.megafon.ru fromuser=mydearuser fromdomain=multifon.ru port=5060 nat=yes context=inbound insecure=port,invite disallow=all allow=ulaw alwaysauthreject=yes language=ru transport = tcp allowguest=no 

в настройках очереди следующее:

[general] persistentmembers = yes autofill = yes [queue-multifon] music = default strategy = ringall timeout = 120 retry = 5 maxlen = 0 joinempty = yes ringinuse = no announce-frequency = 30 announce-holdtime = no announce-position = limit announce-position-limit = 6 queue-youarenext = /etc/asterisk/sounds/support/queue-youarenext queue-thereare = /etc/asterisk/sounds/support/queue-thereare queue-callswaiting = /etc/asterisk/sounds/support/queue-callswaiting queue-thankyou = /etc/asterisk/sounds/support/queue-thankyou member=>SIP/multifon/numberphone ; вместо numberphone - номер телефона для дозвона 

куда копать?