[asterisk-users] chan_sip.c:1968 create_addr: No such host:

[broadbandvoice at comcast.net]

I have followed all the install note for A2billing and have everything installed and configured and my asterisk works except the callingcard application. 
Added the following
[callingcard]
; CallingCard application
exten => 777,1,Answer
exten => 777,2,Wait,2
exten => 777,3,DeadAGI,a2billing.php
exten => 777,4,Wait,2
exten => 777,5,Hangup
I am using 777 as the calling card application. when I call that extension, instead of getting " please enter you pin number" it fails and this is the output from the cli:
-- Executing Dial("SIP/9614-e7ba", "SIP/777|200|rt") in new stack
Feb 18 05:03:38 WARNING[11725]: chan_sip.c:1968 create_addr: No such host: 777
Feb 18 05:03:38 NOTICE[11725]: app_dial.c:1011 dial_exec_full: Unable to create channel of type 'SIP' (cause 3 - No route to destination)
  == Everyone is busy/congested at this time (1:0/0/1)
  == Auto fallthrough, channel 'SIP/9614-e7ba' status is 'CHANUNAVAIL'
Any Help will be greatly appreciated.
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