What is an ideal CST of VoLTE call?

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CST is Time between the start of the call and the moment the phone of the called party starts ringing.

CST Healthy range is <2.5s

Formulae ( Sec )

: Avg of (Time(180 Ringing) - Time( SIP INVITE Request ) )

Impact: High CST will lead to delays & Silence period before Ring; High CST will obviously will deteriorate user experience.

What is an ideal CST of VoLTE call

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