Whatever happened to Sipstation Premium / HD calling?

I was having a discussion about HD voice codecs and it just reminded me that Sipstation once had a trial of hd codec support

I understand hd codecs are extremely hit or miss (mostly miss) when connecting to another carrier, but it seems like there must be some that at least supported it.
Was it dropped because of lack of carrier support, customer interest, technical reasons?
Will it ever make a resurgence?

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