Page 143 - Asterisk™: The Future of Telephony

[incoming_calls]
[phones]
include => internal
include => remote
[internal]
exten => _2XXX,1,NoOp()
exten => _2XXX,n,Dial(IAX2/${EXTEN},30)
exten => _2XXX,n,Playback(the-party-you-are-calling&is-curntly-unavail)
exten => _2XXX,n,Hangup()
[remote]
exten => _1XXX,1,NoOp()
exten => _1XXX,n,Dial(IAX2/osaka/${EXTEN})
exten => _1XXX,n,Hangup()
[osaka_incoming]
include => internal

Using Templates in Your Configuration Files

There is a little-known secret in Asterisk config files that is so brilliant that we had to
devote a little section to it.

Let us say that you have 20 SIP phones that are all pretty much identical in terms of
how they are configured. The documented way to create them is to specify the param-
eters for each. Part of such a sip.conf file might look like this:
[1000]
type=friend
context=internal
host=dynamic
disallow=all
allow=ulaw
dtmfmode=rfc2833
maibox=1000
secret=AllYourSetsAreBelongToUs

[1001]
type=friend
context=internal
host=dynamic
disallow=all
allow=ulaw
dtmfmode=rfc2833
maibox=1001
secret=AllYourSetsAreBelongToUs

[1002]
type=friend
context=internal
host=dynamic

Using Templates in Your Configuration Files | 115