What are the drawbacks if we use precondition?

4G LTE
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1

Hello all.

I have one question related to VoLTE.

What are the drawbacks if we use precondition?

The advantage would be a shorter call setup time but what will be the possible disadvantages?

2

What does preconditions means exactly here?

3

I think reserving resources before alerting to reduce failure is precondition in VoLTE.

4

Basically PRACK messages exchanged

This is when precondition is ON, when PRACK messages are seen.

More details about precondition are here: Dedicated Bearer setup in LTE and impact on VoLTE Precondition – APT

5

Precondition tries to make sure that the resources are available end to end before the call is established.

Hence the drawback to go without Preconditioning would be a case where you may hear a ring but the call may not establish because b-party was unavailable actually.

6

Thanks, but sorry…

My question was what are the drawbacks to use precondition? Any disadvantage? is it a CSCF feature to purchase?

7

Ah. Sorry.

Preconditioning support is needed on Core. (So may be comercials involved).

Also device manufacturers do the certification for Volte with specific parameters and this may be a concern if you want to change.

I cannot think of something more. Maybe someone else can add to this.

8

Thank you!