Call drop is due to S1 out of service or S1 reset

4G LTE
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1

Hi Experts.
If call drop is due to S1 out of service or S1 reset, does in this part handover can play a role for this as I have some nbr sites where there is zero prep success in S1 handover?
How can we correlate this issue further?

2

Hi All.
Without VoLTE S1 handover issue, can call drop on connected mode in S1?

Reason is: S1 out of service in VoLTE drop.

3

If S1 is out of service what do you expect to happen with VoLTE call?
It will drop for sure.

4

S1 failures in VoLTE drop:

image

Hi S1 fail less:

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HO VoLTE:

image

Is it possible to have VoLTE S1 drops with less VoLTE HO S1 fail?
Sudden sync out in VoLTE due to MME.