*Dear List*
Plz help, i am not much experienced with asterisk. i configured it on ubuntu 12.04. no problem when i call any mobile no(0091XXXXXXXXXX) but when i call on my local asterisk no.(101,102 or 105) it is not connecting giving error
“Auto fallthrough, channel ‘SIP/lucknow-0000006f’ status is ‘CHANUNAVAIL’
*while when i call 200 it is playing audiofile successfully. Please help *here is my sip.conf and extensions.conf.

thanks.

*=========================sip.conf============================*

[general]
context=unauthenticated allowguest=yes srvlookup=yes udpbindaddr=0.0.0.0
tcpenable=no register => support@mydomain.net:password@sip.sonetel.com outboundproxy=sip.sonetel.com

[usa_number]
type=friend dtmfmode=rfc2833
context=hello123
host=sip.sonetel.com username=support secret=password nat=yes fromdomain=mydomain.net outboundproxy=sip.sonetel.com insecure=invite disallow=All allow=alaw allow=ulaw allow=gsm

[office-phone](!)
type=friend context=LocalSets host=dynamic nat=yes secret=s3CuR#p@s5
dtmfmode=auto disallow=all allow=ulaw

; define a device name and use the office-phone template
[bombay](office-phone)

; define another device name using the same template
[lucknow](office-phone)

[test5](office-phone)

==========================================================

*====================extensions.conf===========================*

[LocalSets]

exten => _00X.,1, Answer exten => _00X.,n, Set(CALLERID(num)=support)
exten => _00X.,n, Dial(SIP/${EXTEN}@support)
exten => _00X.,n, Hangup

exten => 101,1,Dial(SIP/lucknow)

exten => 102,1,Dial(SIP/bombay)

exten => 105,1,Dial(SIP/test5)

exten => 200,1,Answer()
same => n,Playback(an_audio_file)
same => n,Hangup()

[hello123]
exten => support,1,Answer exten => support,n,Playback(Enterprise-Welcome-message);
exten => support,n, Hangup

==========================================================

regards abhi