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sipx-wiki.calivia.com/index.php/Digit_Maps_used_to_Define_the_Dial_Plan

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Posted by crouse

exten = s,n,Dial(SIP/523&SIP/524&SIP/525&SIP/526&SIP/700&SIP/701&Zap/2)

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Posted by james_winston

Often it is desired that a given extension first ring one phone, and then if there is no answer, ring another phone (or set of phones).
Consider this “Operator” example:

exten => 0,1,Dial(Zap/1,15)
exten => 0,2,Dial(Zap/1&Zap/2&Zap/3,15)
exten => 0,3,Playback(companymailbox)
exten => 0,4,Voicemail(100)
exten => 0,5,Hangup

In this example, when a caller would dial “0” for the operator, we first trying ringing the interface Zap/1 (which is the phone that the
receptionist uses for example). If that interface is busy, or there is no answer after 15 seconds, we try ringing a group of phones (including the receptionist's phone again) for another 15 seconds. If there is still
no answer (or if everyone is busy) then it will playback a message announcing that no one is available, and to please leave a message i
the company mailbox. Finally the caller is dumped into voice mailbox 100, without having any additional announcement played.

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Posted by sagitraz