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Old 29-07-2016, 17:29
jchamier
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Having done some testing between my iPhone on EE and a Vodafone SIM on my Nexus 5 whilst recording the call data with QXDM from the Nexus, it appears that when a call goes through EE's IMS core (VoLTE or Wifi Calling) it isn't HD voice to Vodafone but only when I dropped my iPhone manually down to 3G did the call become HD Voice / AMR-WB 12.65Kbps.

EE on Wifi Calling first then I went to VoLTE over 2600 then 3G @ 2100 (obviously). Vodafone CSFBed down from 4G @ 800 to 3G900 (2938 ARFCN)
Very interesting - so EE and Vodafone are linked directly without going down to POTS and back again, so able to carry AMR-WB codec. I didn't expect that until VoLTE as per previous post.... surprised.
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Old 29-07-2016, 18:17
lightspeed2398
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Very interesting - so EE and Vodafone are linked directly without going down to POTS and back again, so able to carry AMR-WB codec. I didn't expect that until VoLTE as per previous post.... surprised.
I hadn't really expected it full stop. Strange that it works on 3G but not on EE VoLTE. Seems strange
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Old 29-07-2016, 18:33
Toffee-Brann
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Just tried an EE to Vodafone call. Definitely HD voice on EE 3g but not on VoLTE or wificalling.
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Old 29-07-2016, 18:47
jchamier
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I hadn't really expected it full stop. Strange that it works on 3G but not on EE VoLTE. Seems strange
Given EE's carrier profile its hard to test when your devices are iPhones and you're in a 4G area!!
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Old 30-07-2016, 21:54
moox
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I'm not sure the phone is able to distinguish whether or not the phonecall is connected through HD voice to the other end. The phone will be able to detect what codec it is sending/receiving, but won't be able to tell whether or not it has been decompressed at the network level.

My Three G4 shows a HD calling icon against all contacts when it's on 4G, but obviously the phonecall would only be HD if I were ringing another contact on Three.
The network would normally want to eliminate transcoding between codecs where possible, as it's computationally more expensive than just shuffling bits (and it adds a bit of latency), so it should kick down to the lowest common denominator (or something with as few transcoding steps as possible). There's no reason to get an endpoint to send wideband audio if it's going out onto POTS
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Old 02-08-2016, 19:05
Mark C
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Had my first cross network HD call. Vodafone phone to my EE phone.
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Old 21-10-2016, 12:28
sibley88
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I just received a call from an O2 iPhone on my EE iPhone. Definitely HD voice today, first time I have heard that.
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Old 21-10-2016, 12:51
Synthetic42
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Yep, some 02 calls are HD to EE now
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Old 21-10-2016, 20:01
Mark C
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Yep, some 02 calls are HD to EE now
It's 1998 and the start of cross network SMS all over again
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Old 21-10-2016, 20:33
Synthetic42
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It's 1998 and the start of cross network SMS all over again
Exciting times!
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Old 21-10-2016, 21:08
Thine Wonk
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The networks have all been really really slow on this one haven't they.
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Old 21-10-2016, 22:17
dslrocks
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Has anyone had an HD voice call to someone who's not on 3?

I am with 3 but have yet to encounter one between someone else who's not on the same network.
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Old 19-11-2016, 20:34
_m
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I've done some testing with different numbers being called from an EE SIM and can confirm that EE 3G/VoLTE to O2 3G and EE 3G (but not VoLTE) to VF 3G are HD, but could not get any HD voice with Three.
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Old 23-11-2016, 19:39
ozz
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Initiated a call on EE VoLTE to my sister who is on O2, HD voice throughout the 22 minute call. The call ended with 3G my end but there was no loss in quality.
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Old 05-12-2016, 14:36
Skylover4life
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GiffGaff to EE also is HD voice - Even saw "HD" in the top left corner!!
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Old 05-12-2016, 15:02
Ben_Fisher
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Do mvno like bt mobile support HD Voice?
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Old 05-12-2016, 16:33
Synthetic42
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Do mvno like bt mobile support HD Voice?
Yes, not necessarily cross network yet though
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Old 05-12-2016, 19:42
Scott_14
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Anyone experienced any cross-network calls involving Three yet?
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Old 05-12-2016, 22:49
mrMick
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Yes, not necessarily cross network yet though
BT Mobile here, had HD Voice call to and from O2 a number of times. Noticed it a while back.
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Old 06-12-2016, 08:08
Synthetic42
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BT Mobile here, had HD Voice call to and from O2 a number of times. Noticed it a while back.
Excellent, must be following suite with EE, wasn't sure if they would as they use a different core to EE
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Old 06-12-2016, 11:40
mrMick
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I'd say it's less to do with them being an MVNO, and more to do with it just being the technology the underlying network is deploying. There isn't really a reason to exclude MVNOs from it. At the end of the day it's just a phonecall. When the local O2 mast was upgraded to carry 3G and 4G, mum's calls to her friend were HD (O2 Business to Tesco Mobile - MVNO).
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Old 06-12-2016, 15:19
NathDogg
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Anyone experienced any cross-network calls involving Three yet?
Yes I completed a cross-network HD call with Three. Three-EE.
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Old 06-12-2016, 17:50
moox
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Excellent, must be following suite with EE, wasn't sure if they would as they use a different core to EE
(knowing very little about mobile core architecture) I'd guess that some aspects are shared, because if you dial an incorrect number you get the EE voice and announcement, not a special BT one, so I'd speculate that it hits an EE switch and will be using EE's trunks to the outside world
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Old 07-12-2016, 13:37
Gaz82
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Anyone experienced any cross-network calls involving Three yet?
Had a cross network HD call yesterday from Vodafone to Three.
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Old 07-12-2016, 14:20
blueacid
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Looking at the anecdotal evidence in this thread, we can conclude the following:
Vodafone - EE = Yes
Vodafone - O2 = Unknown
Vodafone - Three = Yes
O2 - EE = Yes
O2 - Three = Unknown
EE - Three = Yes

...This assumes that once an HD voice relationship between the networks is set up that calls made from either network to the other can be HD (It'd be horribly complicated if, say, Vodafone dialing EE could be HD, but EE dialing Vodafone could not).


Anyone able to fill in the Unknowns?
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