QUOTE(jayko @ Oct 27 2016, 06:46 PM)
as the news link stated, NOW is strictly Digi to Digi where both end are iPhone VoLTE capable phones. then and only then the VoLTE will go through.
the VoLTE features has to be supported at the LTE's EPC, the equipment is called IMS, within digi own LTE network, which is ZTE, i believe the IMS is also belong to ZTE, i m not sure on this. if it is ZTE, ZTE only need to maintain their own IMS and solve the VoLTE problem if any issue arises. but when you are talking about Inter-Telco VoLTE call, the IMS of telco A will have to route to IMS of telco B to make VoLTE possible, I am not if there has been live or not, I didnt follow this news closely though.
But currently the call will be like this.
For example DiGi user with volte call to YES 4G VoLTE
DiGi user --> DiGi IMS -- > DiGi 2G/3G network ---> YES 4G Gateway -- > YES 4G IMS --- YES 4G user
and both side will using VoLTE 100000000% for sure.
DiGi IMS network connects to other IMS network will be real after this, for better call setup advantages and saving TDM costs.
FYI, government previously still forcing telcos to use TDM for interconnection between telcos.
FYI, ZTE is ZTE. Many issues comes due to legacy 2G/3G/CSFB network. I cannot tell more at here

QUOTE
How can a phone will know who he dial is iphone with volte capability or no before reaching them?
--------a phone with VoLTE capablity will have a tag of this features when making the call setup, when the EPC receive this VoLTE tag, it will check if the destination caller is also on the LTE network and support VoLTE, if it has, then the call will patch through on 4G network, else it would be fallback to 3G or 2G depending on the signal conditions.
A big wrong.
EPC/PGW detect this when user register VoLTE via different APN (which is "ims" for U Mobile, DiGi and Yes 4G, im not sure whether this is standard APN for all VoLTE in the world or no). Then phone will perform SIP registration to IMS network.
Calling will cause phone trigger SIP calling to ANY numbers, as long as the number exist (999 and 112 are still pending MCMC standard).
VoLTE and Wifi calling all using SIP call. A SIP call wont check where is the destination or even the destination is fix line, or mobile or VoLTE or no. The call just go through.
If i am U Mobile and U are digi, and u can know my subscriber using VoLTE or no then GG ad lo me
but end to end HD voice capability can work if both parties agree on this
For example, DiGi VoLTE users ---> DiGi IMS ---> DiGi 23G ---> UM 3G ---> UM users (who phone support HD voice)
But ... slow slow wait.... government very slow at this.
talking about SIP call,
Did u see any skype call cant reach fix line/mobile phones?
Did u see any voip calls cant reach fix line/mobile phones due to they are SIP calling?
All legacy networks are accepting SIP INVITE and processing accordingly.
Those calls between MSCs and between OLOs are now using SIP protocol too(this one seldom, will implement soon).
And im holding iphone 6. I can call anyone using VoLTE (my signal wont drop to 3G).
And also Im part of the VoLTE testing. Im sure how DiGi core network/IMS network works.
QUOTE
volte quality to me is VoLTE features, but the news link claimed it is HD-Voice, which 3G already can support HD voice when circuit switch can handled AMR-WB codec of 12.65Kbps.
as for VoLTE is double the bitrate, or 23.85kbps to be more precise. Calls will sound even clearer, and that is the highest possible bitrate defined in 3GPP standard for VoLTE. which i believe is also the same bitrate for VoWIFI
Im not sure bout this... but normal call is 64kbps dedicated bandwidth... i think HD voice is more to the kHz the audio is captured? even though 3G HD voice also got 6.xx kbps
Currently digi maxis umobile celcom using 12.65kbps for HD voice codec bit.... and UM normal call using 12.2kbps... tat is y UM calls will be only slightly difference between HD call and normal call in its 3G network
https://patentimages.storage.googleapis.com...000025_0001.pngThis post has been edited by prosibu: Oct 27 2016, 09:25 PM