Most viewed questions under tag ims

+4 votes

2 answers

VoLTE: Why I-CSCF and S-CSCF has interface with the HSS and for what purposes it is used ?

posted Aug 5, 2016 by Ganesh

+2 votes

2 answers

Can someone share the call flow for SMS over LTE(IMS)?

posted Aug 20, 2015 by Sandeep Otari

+1 vote

2 answers

Why QCI 9 and QCI 5 are always established and deactivated together?

posted Nov 5, 2017 by Faisal Adeem Siddiqui

0 votes

1 answer

function and differences between record route header and route header in SIP

posted Aug 15, 2016 by anonymous

+1 vote

0 answers

SIP response 380 "Alternative service"

posted May 22, 2018 by Michael Semama

+3 votes

1 answer

"Homogeneous Support of IMS Voice Over PS Sessions" in S6a ULR

posted Apr 23, 2018 by Michael Semama

+2 votes

1 answer

IMS: Function difference between MRFC and MRFP components of Media Resource Function ?

posted Dec 7, 2015 by Harshita

+1 vote

1 answer

How to decide which attach type shall use when UE set “IMS PS Voice preferred and CS Voice as secondary”?

posted Dec 16, 2016 by Jim Tan

+6 votes

4 answers

VoLTE: Does a network need to establish a separate default bearer for IMS call ?

posted Oct 24, 2015 by Harshita

+6 votes

2 answers

LTE: How a LTE UE come to know whether LTE network supports IMS call or not ?

posted Jul 28, 2016 by Vikram Singh

0 votes

0 answers

VOLTE: IFC (Initial Filter Criteria)

posted Sep 12, 2017 by Michael Semama

+3 votes

1 answer

LTE: What is the role of Media Resource Function (MRF) and Application Server (AS) while establishing VoLTE call ?

posted Dec 4, 2015 by Ganesh Kumar

0 votes

2 answers

Can a VoLTE Call Data flow on IMS Default Bearers?

posted Apr 1, 2017 by Anand Yadav

+2 votes

2 answers

LTE: Why a separate default bearer is required to exchange SIP signalling messages between UE and IMS network ?

posted Dec 20, 2016 by Vikram Singh

+1 vote

1 answer

IMS: When a dedicated bearer is established for a VoLTE call and which node initiates it ?

posted Aug 5, 2016 by Ganesh

+1 vote

1 answer

QCI 5 is mandatory for IMS SIP Signalling?

posted Apr 3, 2017 by Anand Yadav

0 votes

0 answers

Local breakout is configured and VPLMN flag is enabled in HSS, still some subscribers using Home PGW for IMS APN.

posted Aug 17, 2022 by Sunil Khandelwal

+3 votes

2 answers

LTE: How many types of charging scenarios come under the online charging system ?

posted Feb 25, 2017 by Vikram Singh

+2 votes

2 answers

What is SIP signalling in QCI table?Why it is needed in LTE?

posted May 22, 2017 by Dheerendra

+3 votes

1 answer

LTE: Why does need a bearer of QCI 5 to exchange SIP signalling messages ?

posted Dec 4, 2015 by Ganesh Kumar

+6 votes

2 answers

IMS: Why is IP sec tunnel established between UE and P-CSCF ?

posted Nov 25, 2015 by Alok

+1 vote

4 answers

The Role of DIAMETER in IMS?

posted Jul 9, 2013 by Salil Agrawal

+2 votes

1 answer

What is the transport layer usually used for the SIP protocol in Volte (UDP/TCP/SCTP)?

posted Feb 27, 2017 by Michael Semama

+1 vote

1 answer

How will UE use MCC MNC values (p-access-network-info header) in LTE-IMS integration?

posted Feb 22, 2016 by anonymous

+3 votes

2 answers

Is it necessary HSS and S-CSCF both the nodes belongs to home network for an IMS call ?

posted Nov 6, 2015 by Vimal Kumar Mishra

+3 votes

1 answer

What is meant by NASS bundled authentication scheme, gprs ims bundled authentication scheme, sip digest auth scheme?

posted Jul 27, 2016 by Vakati Abilasn

+3 votes

1 answer

VOLTE: How the VoLTE call establishes for LTE network and legacy network ?

posted Jan 19, 2016 by Vikram Singh

0 votes

Which QCI bearer is used for IMS signalling ? [MCQ]

posted Dec 19, 2017 by Ganesh

+1 vote

2 answers

SIP: Does all the SIP control messages passes through SIP proxy-server or only a subset of SIP messages?

posted Aug 14, 2016 by Vikram Singh

+4 votes

1 answer

LTE: For the CS fall back what messages are exchanged between IMS, LTE and GSM nodes to continue VoLTE call ?

posted Aug 23, 2016 by Harshita

+1 vote

2 answers

SIP: Why does proxy server respond with 100 trying message ? What if it does not do this ?

posted Aug 14, 2016 by Vikram Singh

+2 votes

1 answer

IMS: How an LTE UE deregisters from the IMS network?

posted Aug 7, 2016 by Vikram Singh

+2 votes

0 answers

How VoLTE charging works?

posted Apr 8, 2016 by Chinmoy Padhi

+1 vote

1 answer

Why Packet error loss rate is allowed more for conversational voice in QCI table?

posted Aug 18, 2017 by Rohit Verma

+1 vote

1 answer

Why IMS required separate PDN?Why cant default PDN controls voice data?

posted Sep 18, 2017 by Sakshi Rai

+2 votes

0 answers

VoLTE: At which stage of SIP registration, P-CSCF establishes secure IP connection with UE ?

posted Aug 5, 2016 by Ganesh

+1 vote

0 answers

MT Call from 2G/3G to VoLTE User

posted Apr 1, 2017 by Anand Yadav

+1 vote

1 answer

LTE: Is it necessary to establish bearer with QCI "5" to support transmission of SIP signalling messages ?

posted Apr 13, 2018 by Harshita

+1 vote

1 answer

SIP: What is the significance of presence of CSeq header filed in request message ?

posted Aug 17, 2016 by Ganesh

0 votes

1 answer

LTE: Is it possible without having IP from default bearer, UE can make IMS call ?

posted Sep 22, 2017 by Harshita

+2 votes

2 answers

How ENB recognize incoming packet is voice packet or data packet?

posted Nov 10, 2017 by Rohit Verma

+1 vote

1 answer

IMS: When the following response codes are used during an established IMS call session ?

posted Aug 1, 2016 by Ganesh

0 votes

0 answers

Does RTP traffic flows If we keep VOLTE call in Mute State?

posted Feb 20, 2020 by Jaganathan

+4 votes

1 answer

Is there any role of HSS while establishing voice call using IMS in lte network ?

posted Oct 11, 2014 by Harshita

+2 votes

0 answers

LTE: How P-CSCF select S-CSCF to send SIP invite request receives from UE ?

posted Feb 25, 2017 by Vikram Singh

+2 votes

0 answers

what are the Online Charging parameters for IMS calls (VoLTE)?

posted Feb 23, 2017 by Gurusamy Narayanaswamy

+3 votes

1 answer

what does it mean if SIP SUBSCRIBE Method includes event as "reg"?

posted Dec 25, 2016 by Vinay Kumar Tokala

+2 votes

1 answer

What are all identifiers used for an UE in IMS network ?

posted Nov 7, 2015 by Harshita

+1 vote

1 answer

How Proxy Call Session Control Function(P-CSCF) works for LTE users ?

posted Sep 19, 2013 by Neeraj Mishra

0 votes

0 answers

How the preemption works in volte network?

posted Jul 26, 2019 by anonymous