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Настройки *

iax.conf:

[general]
bindport=4569
bindaddr=0.0.0.0
language=en
bandwidth=low
allow=ilbc
jitterbuffer=no
tos=lowdelay
[300]
type=friend
host=dynamic
username=300
secret=300
context=office
callerid="User 300"
[301]
type=friend
host=dynamic
username=301
secret=301
context=office
callerid="User 301"

sip.conf

[general]
context=office
port=5060
bindaddr=0.0.0.0
[1000]
type=friend
host=dynamic
username=1000
secret=1000
nat=no
canreinvite=no
context=office
callerid="User1000"
alow=gsm
[1001]
type=friend
host=dynamic
username=1001
secret=1001
nat=no
canreinvite=no
context=office
callerid="User1001"
allow=gsm

extensions.conf
[general]
static=yes
writeprotect=yes
[globals]
[default]
[office]
exten => 300,1,Dial(IAX2/300,10,r)
exten => 301,1,Dial(IAX2/301,10,r)
exten => 1000,1,Dial(SIP/1000,10,r)
exten => 1001,1,Dial(SIP/1001,10,r)

С такими настройками нормально работают звонки SIP <-> SIP и IAX -> SIP (в качестве SIP-клиента используется Sjphone, IAX - iaxComm). В случае IAX <-> IAX, я слышу звонок, но ответить не могу - нажимаю Speaker и ничего не происходит. В консоли вижу:

-- Accepting AUTHENTICATED call from 192.168.46.2, requested format = 512, actual format = 512
Urgent handler
-- Executing Dial("IAX2/300@192.168.46.2:4569/1", "IAX2/301|10|r") in new stack
Urgent handler
Urgent handler
-- Called 301
Urgent handler
Urgent handler
-- Call accepted by 192.168.46.97 (format gsm)
Urgent handler
-- Format for call is gsm
Urgent handler
-- IAX2/301/3 is ringing
Urgent handler
Urgent handler
Urgent handler
Urgent handler
Urgent handler
Urgent handler
-- Nobody picked up in 10000 ms
Urgent handler
Urgent handler
Urgent handler
-- Hungup 'IAX2/301/3'
Urgent handler
Urgent handler
Urgent handler
Urgent handler
Oct 28 16:15:13 WARNING[27122]: pbx.c:1949 ast_pbx_run: Timeout, but no rule 't' in context 'office'
-- Hungup 'IAX2/300@192.168.46.2:4569/1'

В случае SIP -> IAX я вообще не дозваниваюсь:

-- Executing Dial("SIP/1001-a13f", "IAX2/300|10|r") in new stack
Urgent handler
Oct 28 16:16:46 NOTICE[27124]: app_dial.c:764 dial_exec: Unable to create channel of type 'IAX2'
== Everyone is busy/congested at this time
Urgent handler
Oct 28 16:16:56 WARNING[27124]: pbx.c:1949 ast_pbx_run: Timeout, but no rule 't' in context 'office'

Что я делаю неправильно?