VOLTE Call Flow Part2

VolTE Call Flow
PDN Connectivity Request
Activate default EPS Bearer Context Request
Activate default EPS Bearer Context Accept
default and dedicated bearers
QCI
IMS
Wireshark logs.

[@MG-qu9ig]

Thank you so much for this valuable content.
Cover all the possible topics and Keep growing..
All the best👍

[@puliraju9222]

Very informative 👌.thank you for your efforts.

[@lteplusplus1225]

Thanks Raju for your feedback.

[@surajpratapsaroj1690]

Very Supportive Video Sir
Very Very Thanks Sir

[@sistuyugandar3254]

Good Explanation sir...

[@soumyakantapradhan4212]

Thank you so much sir

[@danylunny8142]

thank you

[@kanchanverma3298]

Awasome sir ...pls use some animation .....for upcoming videos

[@kanchanverma3298]

Awasome lecture .....

[@lteplusplus1225]

Thanks Kanchan for your feedback.

[@avinashmvenugopalan5772]

Sir is pdn qci 9 connectivity required for volte calls?what is the significance of pdn in ims call flow

[@lteplusplus1225]

Not required Avinash..QCI-9 is for browsing internet. PDN is external network ... ims is PDN when we use VoLTE.

[@salim0151]

Pls make call flow for csfb

[@simpsonmathew1361]

Hi bro
Couple of questions.
1. Are DRBs and dedicated bearer the same.
2. What is the use of drb 4,5,6,7,8 esta blishment in LTE.
3. Is it like more DRBs are activated based on throughput requirement ie. the more data ul/dl is ongoing more DRBs will be activated?
Thanks in advance!

[@lteplusplus1225]

1. Are DRBs and dedicated bearer the same. --> No. DRB is part of both dedicated & default bearer. DRB is Radio bearer (between UE & eNB). Bearer i sestablished between UE & PGW. For more detail follow my below tutorials (Part1 - 10):
th-cam.com/video/nMJjyBku5V8/w-d-xo.html
2. What is the use of drb 4,5,6,7,8 esta blishment in LTE.---> I guess you are talking about QCI-4,5,6,7,8. Refer below URL for details:
www.sharetechnote.com/html/Handbook_LTE_QCI.html
3. Is it like more DRBs are activated based on throughput requirement ie. the more data ul/dl is ongoing more DRBs will be activated? -->No. If current bearer is not able to provide you the new requested service then additional bearer are required. Like QCI-9 could not serve VoLTE call. For VoLTE call bearer with QCI-5 & 1 will be established.

[@simpsonmathew1361]

@@lteplusplus1225 thanks a lot

[@0309pan]

What could be reason for mutiple 200 ok messages?

[@lteplusplus1225]

Hi Pankaj... Most of the messages like REGISTER, BYE, 183 SESSION IN PROGRESS are ACKNOWLEDGED by IMS using 200 OK...that's why logs are showing multiple 200 OK messages.

[@0309pan]

@@lteplusplus1225 Thanks