Recent posts under tag sip

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What if the Caller doesn't receive the SIP_PRACK/OK message from receiver ?

posted Mar 13, 2020 by Ankit Mishra

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What is SIP 500 internal Error means?

posted Mar 12, 2020 by Akhilesh

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Can we establish VOLTE call in Scell?

posted Mar 5, 2020 by Himani

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

posted Feb 20, 2020 by Jaganathan

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VoLTE: How does voice call establish when one party using VoLTE technology and the other one using 2G ?

posted Jan 1, 2019 by Vikram Singh

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In IMS VoLTE call, how to identify IPs assigned to phone numbers from control traffic (SIP, SDP …)?

posted Dec 6, 2018 by anonymous

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

posted Jul 28, 2018 by Harshita

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

posted Apr 13, 2018 by Harshita

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

posted Dec 19, 2017 by Ganesh

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

posted Sep 22, 2017 by Harshita

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VOLTE: IFC (Initial Filter Criteria)

posted Sep 12, 2017 by Michael Semama

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VOLTE: Location information in S8HR

posted Sep 12, 2017 by Michael Semama

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

posted Aug 21, 2017 by Rohit Verma

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

posted Aug 18, 2017 by Rohit Verma

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What is the use of flow label field in SIP header?

posted Aug 17, 2017 by Rohit Verma

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When i make whatsapp call or IMO call will it go via SIP protocol or different protocol?

posted Aug 17, 2017 by Rohit Verma

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How UE distinguish incoming packet (from UE upper layer not from ENB) is SIP data or something else packet?

posted Aug 16, 2017 by Rohit Verma

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

posted Aug 16, 2017 by Rohit Verma

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how to check the P-CSCF that is configured in the UE

posted Jun 20, 2017 by anonymous

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

posted May 22, 2017 by Dheerendra

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PSI of the SC of the SM-over-IP sender. What is PSI and SC here?

posted Apr 9, 2017 by Sneha Maganahalli

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QCI 5 is mandatory for IMS SIP Signalling?

posted Apr 3, 2017 by Anand Yadav

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Interworking of UMTS/GSM with VoLTE?

posted Apr 1, 2017 by Anand Yadav

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MT Call from 2G/3G to VoLTE User

posted Apr 1, 2017 by Anand Yadav

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Can a VoLTE Call Data flow on IMS Default Bearers?

posted Apr 1, 2017 by Anand Yadav

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

posted Feb 27, 2017 by Michael Semama

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

posted Feb 25, 2017 by Vikram Singh

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

posted Dec 25, 2016 by Vinay Kumar Tokala

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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

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SIP install error on windows using python 32bit?

posted Dec 12, 2016 by anonymous

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

posted Aug 18, 2016 by Vikas Upadhyay

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

posted Aug 18, 2016 by Neelam

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

posted Aug 17, 2016 by Ganesh

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

posted Aug 15, 2016 by anonymous

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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

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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

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

posted Aug 14, 2016 by Vikram Singh

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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

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

posted Aug 5, 2016 by Ganesh

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

posted Aug 5, 2016 by Ganesh

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SIP: What is the functionality of ENUM node that residents in the SIP network ?

posted Aug 3, 2016 by Ganesh

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

posted Aug 1, 2016 by Ganesh

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IMS: In what scenarios, an UE (IMS client) sends subscribe message to IMS server and when server notify UE ?

posted Jul 31, 2016 by Ganesh

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SIP: Need some clarity on dtmf options like info, notify and any other dtmf options.

posted May 3, 2016 by anonymous

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From which layer of sip stack (transport layer, transaction layer or transaction user), sip messages get generated?

posted Apr 3, 2016 by anonymous

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

posted Dec 7, 2015 by Harshita

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

posted Dec 4, 2015 by Ganesh Kumar

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

posted Nov 25, 2015 by Alok

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

posted Nov 7, 2015 by Harshita

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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