[Asterisk-Users] forwarding Sip call to IAX and vice-versa

[Daniel HAIDUC]

hello everyone. i am a new user with asterisk and just playing with it, 
trying to make different configurations.
i have managed to make a call from a sip to another sip phone and 
recently from iax to sip, but not from iax to iax and iax to sip
below are my extensions.conf and the error asterisk is reporting. i 
tryed to keep everything as simple as possible.
thank you for your responses

daniel

[SIP]
exten=> 1000,1,Dial(SIP/cipi,20)
exten=> 1000,2,Answer
exten=> 1000,3,Hangup

exten=> 1001,1,Dial(SIP/nicu,20)
exten=> 1001,2,Answer
exten=> 1001,3,Hangup

exten=> 1002,1,Dial(SIP/bibi,20)
exten=> 1002,2,Answer
exten=> 1002,3,Hangup

exten=> 2000,1,Dial(IAX/dani,20)
exten=> 2000,2,Answer
exten=> 2000,3,Hangup

[IAX]
exten=> _NXXX,1,Dial(IAX/dani,20)
exten=> _NXXX,2,Answer
exten=> _NXXX,3,Hangup

exten=> _XXXX,1,Dial(SIP/nicu,20)
exten=> _XXXX,2,Answer
exten=> _XXXX,3,Hangup


Executing Dial("SIP/nicu-3cbb", "IAX/dani|20") in new stack
Apr 21 20:30:42 WARNING[3497]: channel.c:1901 ast_request: No channel 
type registered for 'IAX'
Apr 21 20:30:42 NOTICE[3497]: app_dial.c:746 dial_exec: Unable to create 
channel of type 'IAX'
== Everyone is busy/congested at this time
-- Executing Answer("SIP/nicu-3cbb", "") in new stack
-- Executing Hangup("SIP/nicu-3cbb", "") in new stack