Обрыв связи при ответе на входящий звонок с H323-транка

Здравствуйте!

Имею Elastix 2.4.0 с Asterisk 1.8.20.0 на борту. На нем настроен один транк H323, сделанный с помощью модуля ooh323. Исходящая связь работает, входящая - только зумер вызова, сразу после снятия трубки - отбой (короткие гудки).

в лог пишется такое:

ERROR: No Open LogicalChannels - Failed FindLogicalChannelByChannelNo (incoming, ooh323c_6

в консоли (asterisk -r) такое (ip провайдера voip изменен):

-- SIP/104-00000006 is ringing
    -- SIP/104-00000006 answered OOH323/1.2.3.4-6
  == Spawn extension (macro-dial-one, s, 37) exited non-zero on 'OOH323/1.2.3.4-6' in macro 'dial-one'
  == Spawn extension (macro-exten-vm, s, 9) exited non-zero on 'OOH323/1.2.3.4-6' in macro 'exten-vm'
  == Spawn extension (from-did-direct, 104, 1) exited non-zero on 'OOH323/1.2.3.4-6'
    -- Executing [h@from-did-direct:1] Macro("OOH323/1.2.3.4-6", "hangupcall,") in new stack
    -- Executing [s@macro-hangupcall:1] GotoIf("OOH323/1.2.3.4-6", "1?endmixmoncheck") in new stack
    -- Goto (macro-hangupcall,s,9)
... пропущено
-- Executing [s@macro-hangupcall:50] AGI("OOH323/1.2.3.4-6", "hangup.agi") in new stack
    -- Launched AGI Script /var/lib/asterisk/agi-bin/hangup.agi
    -- <OOH323/1.2.3.4-6>AGI Script hangup.agi completed, returning 0
    -- Executing [s@macro-hangupcall:51] Hangup("OOH323/1.2.3.4-6", "") in new stack
  == Spawn extension (macro-hangupcall, s, 51) exited non-zero on 'OOH323/1.2.3.4-6' in macro 'hangupcall'
  == Spawn extension (from-did-direct, h, 1) exited non-zero on 'OOH323/1.2.3.4-6'

содержание файла /etc/ooh323.conf:

[general]
port = 1720
bindaddr = 0.0.0.0
e164=100
callerid=xxx-Asterisk
gateway=no
gatekeeper = DISABLE
h245tunneling=yes
mediawaitforconnect=yes
logfile=/var/log/asterisk/h323_log
context=from-trunk
dtmfmode=rfc2833

[1.2.3.4]
type=friend
context=from-trunk
ip=1.2.3.4
port=1720
rtptimeout=60
dtmfmode=rfc2833
h245tunneling=yes
disallow=all
allow=alaw
allow=ulaw
allow=g723
allow=g729