Digium TDM410 - Dial Plan

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Chapter 3: Configuration
Dial Plan
Open
extensions.conf, which contains a large, complex sample dial
plan. In this step, you will configure a basic dial plan to enable you to
send and receive calls. Go to the bottom of the file and add the following
lines:
[Internal]
exten => 1000,1,Dial(DAHDI/1,20,rt)
exten => 1000,2,Voicemail(1000,u)
exten => 1000,102,Voicemail(1000,b)
exten => 2000,1,Dial(DAHDI/2,20,rt)
exten => 2000,2,Voicemail(2000,u)
exten => 2000,102,Voicemail(2000,b)
exten => 8500,1,VoiceMailMain
exten => 8501,1,MusicOnHold
exten => _9.,1,Dial(DAHDI/g2/www${EXTEN:1})
exten => _9.,2,Congestion
[Incoming]
exten => s,1,Answer
exten => s,2,Dial(DAHDI/g1,20,rt)
exten => s,3,Voicemail(1000,u)
exten => s,103,Voicemail(1000,b)
In this example there are two internal extensions (1000 and 2000), a
number to check voicemail (8500), a number to listen to music-on-hold,
http://ArtTel.ru