FreePBX и транк PCTEL.RU

Приветствую!

Прошу помочь разобраться с проблемой при регистрации на транке pctel.ru.

Конфигурация транка:

Trunk Name: PCTEL
Outbound Caller ID:20015951
Dialed Number Manipulation Rules: .

Outgoing Settings

Trunk Name: pctel.ru
disallow=all
allow=alaw&ulaw&gsm&ilbc
canredirect=no
canreinvite=no
host=sip.pctel.ru
insecure=port,invite
secret=PASSWD
type=peer
username=20015951
fromuser=20015951
fromdomain=sip.pctel.ru
context=from-trunk

Incoming Settings

USER Context:20015951
secret=PASSWD
type=user
context=from-trunk

Register String:

20015951:PASSWD@sip.pctel.ru/20015951

В логах такие сообщения:

[Oct 30 12:14:22] NOTICE[7682] chan_sip.c: -- Registration for '20015951@sip.pctel.ru' timed out, trying again (Attempt #4)
[Oct 30 12:14:22] NOTICE[7682] chan_sip.c: Failed to authenticate on REGISTER to '20015951@sip.pctel.ru' (Tries 3)
[Oct 30 12:14:42] NOTICE[7682] chan_sip.c: -- Registration for '20015951@sip.pctel.ru' timed out, trying again (Attempt #8)
[Oct 30 12:14:42] NOTICE[7682] chan_sip.c: Failed to authenticate on REGISTER to '20015951@sip.pctel.ru' (Tries 3)
и т.д.