[asterisk-users] Calling users to the external domain using Asterisk

[Aadilkhan Maniyar]

Hi All,
 
I am a newbie to Asterisk. Presently I am working with Asterisk 1.4.17
and using it to make SIP calls.
I have a configuration of Asterisk which serves the users in a
particular domain, say internal.com
I would like to make a SIP call from bob at internal.com to
charles at external.com 
I have added the following lines in extensions.conf
exten =>  charles,1,Dial(SIP/${EXTEN}@external.com)
exten =>  charles,2,Hangup
 
Asterisk does a DNS SRV lookup and resolves the external.com to its
proper IP and calls are established.
But the problem with the above configuration is that I have manually
added users that are in the external domain.
 
Is there any way wherein I can call the users in external.com without
adding them in the extensions.conf?
 
Any help would be appreciated.
 
Thanks,
Aadil
 
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