04-12-2013 05:24 AM - edited 03-16-2019 04:46 PM
Hi guys
In an environment with
UCM 8.6 ----> SBC (internal) -----> SBC (Servce Provider) -----> destination
What is the impact of this command:
rel1xx disable
and
rel1xx enable
Can you help me with clarification?
Solved! Go to Solution.
04-12-2013 05:36 AM
This command is used to require reliability of provisional responses. Provisional responses are 180 ringing, 183 session progress hence the reason for 1XX.. PRACK is used for this purpose
By default provisional responses are not sent reliably. Hence if a 183 session progress is sent and lost, it will not be retransmitted.
When you enable relxx, you are telling the other party that you want reliability with your provisional responses...consequently when you disable it, you return back to the default behaviour which is to send provisional responses unreliably.
In some scenarios PRACK is used when the end party wants to play annoucnement or some media before sending a 200 OK, in scenarios like this you will need to enable rel1xx
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"opportunity is a haughty goddess who waste no time with those who are unprepared"
04-12-2013 05:36 AM
This command is used to require reliability of provisional responses. Provisional responses are 180 ringing, 183 session progress hence the reason for 1XX.. PRACK is used for this purpose
By default provisional responses are not sent reliably. Hence if a 183 session progress is sent and lost, it will not be retransmitted.
When you enable relxx, you are telling the other party that you want reliability with your provisional responses...consequently when you disable it, you return back to the default behaviour which is to send provisional responses unreliably.
In some scenarios PRACK is used when the end party wants to play annoucnement or some media before sending a 200 OK, in scenarios like this you will need to enable rel1xx
Please rate all useful posts
"opportunity is a haughty goddess who waste no time with those who are unprepared"
08-20-2015 02:28 AM
Hello Ayodeji,
If the other end is sending 180/183 messages with 100rel required.
How can we enable on our device to send PRACK messages?
We can configured voice gateway on a router and we are facing issues in the outgoing calls.
When I have checked in the logs we are getting 180/183 messages with 100rel require. So I want to know do we have to enable PRACK messages on router or these are by default enabled.
11-22-2015 06:20 AM
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