[bluesign]

I think it depends; speculating but probably volte is a very complicated spec with many optional enhancements ( think ssl with cipher types )

So carrier can choose to whitelist/blacklist phones depending on extensions available

[pbasista]

> whitelist/blacklist phones depending on extensions available

That would be, I believe, fine. Those are capabilities-based restrictions.

From my point of view, the issue would be if the same phone worked with the same technology over the same mobile network when connected via a carrier A but the same phone on the same network refused to work with the same technology when connected via a carrier B.

[bluesign]

> From my point of view, the issue would be if the same phone worked with the same technology over the same mobile network when connected via a carrier A but the same phone on the same network refused to work with the same technology when connected via a carrier B.

But thats the whole point of carrier profiles ( If I didn't understand wrong. )

Eventually it is the carrier who decides what you can do. ( this can also may be related to deals they made with manufacturers )

I think in this case, it is just missing carrier profile. ( which is like a config file )