[Asterisk-Users] Unable to create channel of type 'IAX2'

[Androtech]

Hi all,
I'm a newbie and I have a configuration problem with Asterisk.
Seems that I'm not able to call an outbound number. I'm quite sure that it 
is a configuration problem, but I'm not able to find out where is the 
mistake, even reading several docs to www.voip-info.org.
I do not have a good knowledge of Asterisk, I'm not very familiar with its 
configuration and I've a big confusion about it.
Any help will be appreciated.

When I try to call outside I got the following message:

*CLI>     -- Accepting AUTHENTICATED call from 192.168.0.55:
       > requested format = ilbc,
       > requested prefs = (),
       > actual format = gsm,
       > host prefs = (gsm|ilbc|speex),
       > priority = mine
    -- Executing Dial("IAX2/emi at emi/2", "IAX2/3479450772") in new stack
Mar 12 16:15:36 WARNING[3149]: chan_iax2.c:2341 create_addr: No such host: 
3479450800
Mar 12 16:15:36 NOTICE[3149]: app_dial.c:911 dial_exec_full: Unable to 
create channel of type 'IAX2' (cause 3)
  == Everyone is busy/congested at this time (1:0/1/0)
Mar 12 16:15:47 WARNING[3149]: pbx.c:2028 ast_pbx_run: Timeout, but no rule 
't' in context 'fullaccess'
    -- Hungup 'IAX2/emi at emi/2'

My zapata.conf is:

[channels]
language=it
context=fullaccess
signalling=fxs_ks
usecallerid=yes
hidecallerid=no
callwaiting=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
rxgain=0.0
txgain=0.0
group=1
pickupgroup=1
immediate=yes
musiconhold=default channel => 1
channel=1

My iax.conf is:

[general]
bindaddr=0.0.0.0
context=noaccess
group=1
callgroup=1
pickupgroup=1
amaflags=default
bandwidth=low
disallow=all ; same as bandwidth=high
disallow=ulaw
disallow=alaw
allow=gsm
allow=iLBC
allow=Speex
jitterbuffer=yes
dropcount=2
maxjitterbuffer=500
maxexccessbuffer=400
tos=throughput

[guest]
type=user
context=iaxguest
callerid="Guest IAX User"

[emi]
type=friend
username=emi
secret=none
auth=md5
host=dynamic
context=fullaccess
mailbox=101
callerid="Emi"<102>
"iax.conf" 44L, 621C

and my extension.conf is:

[general]
static=yes
writeprotect=yes

[fullaccess]
include => parkedcalls
include => local

[local]
exten => _XXXXXXXXXX,1,Dial(IAX2/${EXTEN})


Where is the mistake?
Regards,