How to connect to outside phone lines

I have many years of experience in Linux and Computer Networking but I am not very familiar with Telephony concepts. Can someone explain simply or provide and example how a VOIP (SIP) call can be connected to an outside line (Cell Phone, Home Phone, etc.)

I have a program on my computer that can call IP addresses using SIP, but how do I call phone numbers (I.E. 111-222-3333) with asterisk?

Any help would be greatly appreciated.


I think that question is probably too basic for here. The best starting point is probably to go to and download the free copy of Asterisk: The Definitive Guide. That will tell you about the basic concepts of telephony and Asterisk and get you started. You will then be able to get support on more specific issues here. You are about to embark on an exciting journey!

I agree with jay272bea.

Short answer for the question is: you need a sipprovider to which you send your call and the sipprovider brings it to the landline network. Or you connect your asterisk to the landline network with a sipgateway or telephony-card (Digium produces these :smiley: )

But there are other ways too. But you better get more basic background for those.