This Video covers VoLTE SIP IMS Registration procedure in depth & Provides extract of 3GPP / GSMA Specs , I am covering below call flow in Depth.

IMS registration

LTE Attach & Default Internet EPS bearer

Role of QCI-1 ( Voice ) ,

QCI-5 (SIP Signaling) ,

QCI-6 to 9 (Internet)

Default Vs Dedicated Bearer in LTE

Default IMS EPS bearer in LTE

SIP and IMS Registration

TAS Registration

4. Volte call flow – SIP Call Flow – IMS Call procedure

Thank you Vikas Shokeen