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Building Telephony Systems with OpenSER by Flavio E. Goncalves

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Chapter 8. Call Forward and Voice Mail

The call forwarding feature is an important feature for VoIP providers. It is implemented using forking or redirection. When you use forking, a new call leg is created, sending a new INVITE to the new destination after the first destination fails (busy or timeout). Using redirection, the proxy sends an answer to the call originator and gives it the address where it should redirect the call.

By the end of this chapter you will be able to:

  • Describe concepts such as forking and redirection
  • Implement call forwarding
  • Implement call forward on busy
  • Use the AVP resource to store call forward data
  • Use the failure route to forward unanswered and busy calls

We will use just forking on this material, because it is safer than ...

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