top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

Can a VoLTE Call Data flow on IMS Default Bearers?

0 votes

In Other Words VoLTE Call Established and No Dedicated Bearers established by NW, Is it Possible the call will be stable ? Can It use IMS Defaulr Bearers for the Call?

posted Apr 1, 2017 by Anand Yadav

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

2 Answers

+2 votes

Hi yadav,

As per my understandings QOS 1 is for conversational voice and QOS 5 is for IMS signalling. so with IMS PDN you can create QOS 5 as default bearer and use it for IMS signalling then you can create dedicated bearer with QOS 1 for IMS data flow. But if you use same IMS signalling you will not face any problem instead you will get good clarity because QOS 1 and QOS 5 is of same property with only priority change (QOS 5 is having higher priority than QOS 1).

Note : you will face problem if you use default bearer for IMS calling when you have more GBR(guaranteed bit rate ) dedicated users. because default bearer is always an N-GBR so there is no guarantee for constant bit rate.

answer Apr 3, 2017 by Jaganathan
Thanks Jaganathan for the reply. So You mean to say that there should not be any problem for the Voice if Dedicated Bearers not established. But I have observed that for some operators if Dedicated Bearers didnt established then Call will be dropped after Tqos timer expiry. But Few Operators the Call is still stable and it uses Default bearers for RTP. Is is still Valid?
Yes it is. It is depends on the operator implementation. If operator supports an default bearer RTP transfer then you can make it.
So Finally these things are Operator Specific. Thanks for your reply.
+1 vote

Yes it is possible , but it depend also on handset chopset

answer Dec 12, 2017 by Ahmed Shaban
Similar Questions
+1 vote

Which of the network node initiates dedicated bearer creation for the VoLTE call ?

+2 votes

Is it mandatory to establish a separate default bearer to exchange IMS signaling messages between UE and IMS network nodes ? Can't internet default bearer be used for the same ?

0 votes

In IMS VoLTE setting of a telecom network, what part/field of which type of packet (SIP, SDP, others...) gives authentic information of MSISDN-IP mapping? From a sample traffic, I need to find out information from control traffic about what IP is assigned to what phone number. In the sample traffic, I see a lot of protocols (SIP, SDP, RTP, DIAMETER, ISUP, ....). I require to find out IPs assigned to phone numbers. I know RTP flows between end devices (phones), but I need to find out IPs before the call is established...

+1 vote

Redirection (3xx), Client failure (4xx), Server failure (5xx) and Global failure (6xx) in which scenarios these codes are used ?