Most answered questions under tag ims

+6 votes

4 answers

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

posted Oct 24, 2015 by Harshita

+1 vote

4 answers

The Role of DIAMETER in IMS?

posted Jul 9, 2013 by Salil Agrawal

+2 votes

2 answers

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

posted Nov 10, 2017 by Rohit Verma

+1 vote

2 answers

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

posted Nov 5, 2017 by Faisal Adeem Siddiqui

+2 votes

2 answers

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

posted May 22, 2017 by Dheerendra

0 votes

2 answers

Can a VoLTE Call Data flow on IMS Default Bearers?

posted Apr 1, 2017 by Anand Yadav

+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

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

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

+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

+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

+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

+6 votes

2 answers

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

posted Nov 25, 2015 by Alok

+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

+4 votes

2 answers

Which node takes care of VoLTE charging ?

posted Oct 27, 2015 by Harshita

+2 votes

2 answers

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

posted Aug 20, 2015 by Sandeep Otari

0 votes

2 answers

Do we need a default bearer for IMS registration?

posted Jun 17, 2015 by anonymous

+2 votes

2 answers

Can someone please share a good link or good book to understand IMS stuff ?

posted Sep 19, 2013 by Ganesh Kumar

+1 vote

1 answer

What is SIP 500 internal Error means?

posted Mar 12, 2020 by Akhilesh

+1 vote

1 answer

Can we establish VOLTE call in Scell?

posted Mar 5, 2020 by Himani

0 votes

1 answer

How does IMS protocol works?Is this same as VOIP ?

posted May 28, 2019 by Bharat Kumar

+1 vote

1 answer

Does HO possible in emergency call?

posted Aug 30, 2018 by Jaganathan

+2 votes

1 answer

IMS: How does S-CSCF locate PGW for a terminating VoLTE call ?

posted Jul 28, 2018 by Harshita

+3 votes

1 answer

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

posted Apr 23, 2018 by Michael Semama

+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

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

+1 vote

1 answer

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

posted Sep 18, 2017 by Sakshi Rai

+1 vote

1 answer

VOLTE: Location information in S8HR

posted Sep 12, 2017 by Michael Semama

–1 vote

1 answer

VOLTE and SIP/IMS are the same technology or VOLTE is like normal 2G call?

posted Aug 21, 2017 by Rohit Verma

+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

SIP/IMS layer is application layer or LTE protocol layer?

posted Aug 16, 2017 by Rohit Verma

+1 vote

1 answer

QCI 5 is mandatory for IMS SIP Signalling?

posted Apr 3, 2017 by Anand Yadav

0 votes

1 answer

How voice packets flows through IMS network and reach to end user?

posted Feb 28, 2017 by anonymous

+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

+3 votes

1 answer

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

posted Dec 25, 2016 by Vinay Kumar Tokala

+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

+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

+2 votes

1 answer

Can there be two trf uri in Feature-Cap header ?

posted Aug 18, 2016 by Vikas Upadhyay

0 votes

1 answer

SIP: When does proxy server initiate authentication/authorization for the received INVITE request ?

posted Aug 18, 2016 by Neelam

+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

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

posted Aug 15, 2016 by anonymous

+1 vote

1 answer

SIP: In what cases or scenarios, an user agent can send INVITE within an already established Dialog between UAC and UAS?

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

+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

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

posted Aug 1, 2016 by Ganesh

+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

+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

1 answer

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

posted Jan 19, 2016 by Vikram Singh

+2 votes

1 answer

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

posted Dec 7, 2015 by Harshita

+3 votes

1 answer

How many types of application servers are defined by IMS architecture ?

posted Dec 6, 2015 by Neeraj Mishra