What do the letters HD mean in black outlines in grey bubble next to a contact name?

[AC Question]

what does the letters HD mean in black ouines in grey bubble. next to a contact name?

I have a galaxy s3. what does the letters HD mean in black outlined in a grey bubble next to contact name in your call log?

 

[SpookDroid]

Re: what does the letters HD mean in black ouines in grey bubble. next to a contact name?

If your carrier supports it, your phone supports it, and the person you call suppports it, that means HD Audio was used for the call.