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?