Here is what I am trying to do:
When * get a inbound call, it should ring 101 and 102 (both are SIP extension registered on the * box), if 101 and 102 does not answer within 15 sec then the * box will keep ringing 101 and 102, meanwhile, it should start dial my cellphone(6383279158) as well.
So I did this:
exten => s,1,Dial(SIP/101&SIP/102&SIP/158)
exten => 158,1,Wait(15)
exten => 158,2,Dial(SIP/VoipProvider/6383279158)
Now it seems the problem is how to make 158 registered on *box as a SIP extension. (custome extension? how?)
If I dial 158 from 101, the *box do wait 15sec then dial my cellphone.
How to make this works? Thanks for help.