Messages ACK or PRACK Missing Incorrectly in The Flow And Resulting in The Timeouted State (Doc ID 2233969.1)

Last updated on NOVEMBER 17, 2023

Applies to:

Symptoms

Certain types of messages are missing in OCOM (in the message flow, in Call Details' Messages tab or in downloaded pcap), depending on the scenario:

• - the ACK for the 200OK (of INVITE) that completes the 3 way connection establishment
• - the PRACK if reliable provisional messages are used

And the consequent messages are sometimes missing too.

A sample flow of how it could look like (but depending on scenario it may vary):

As well such a call would end after certain time with 'Timed out' State and before while Established the State details showing '200 OK seen, waiting for ACK', as shown on the picture:

Changes

n/a

Cause

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