[Asterisk-Users] 711 and 729 with IAX? (IAX Newbie)

[Matthew Boehm]

If I send a call to a provider over SIP, I have to designate which codec to
use (711 or 729).
Having never used IAX I have to ask: If I send a call via IAX does IAX use
711/729 as well?
If a SIP 729 call uses 20Kbps, what does an IAX/729 call use?

Thanks,
Matthew