How Avaya Uses the SIP PRACK Method for Reliable Call Flow

Andrew Prokop (@ajprokop), a SIP and VoIP expert since 1990, writes the well-respected Unified Communications blog, SIP Adventures.

Known for his in depth look at the finer details of SIP, UC, and VoIP; Prokop recently posted A Detailed Look at the SIP PRACK Method.

PRACK stands for Provisional Response Acknowledgement which may not mean much to you until you know that it’s a method that “adds a layer of reliability to an otherwise unreliable call flow.”

And reliable communication is probably a good thing, right?

PRACK – Not the First SIP Fix, Nor the Last

There are bound to be glitches as more and more businesses continue to adopt SIP, just like any other product or service you use.

The increased use of SIP will also uncover new ways to use the protocol, much like how the Internet of Things allows devices to do more things for us than we originally devised,

The SIP PRACK method is intended to improve network reliability but while it’s acting as one step towards addressing issues, it’s also opening the door for increased functionality.

How Avaya Phone Systems Use SIP PRACK

For you Avaya users out there, Prokop wrote the complimentary post, Understanding SIP PRACK for Avaya Aura that shows:

  • Real life call flows on an Avaya system
  • How to use the Avaya traceSM utility, an interactive script for admins, to trace PRACK messages
  • When Avaya uses PRACK
  • When Avaya doesn’t use PRACK

Learn more here.

Guide To: Trunk on Avaya IP Office Manager Version 7, Version 8