I am considering switching my pbx over to using g729a from ulaw. I have found several sites saying that the bandwidth needed is a bit less for g729, but the cpu usage will increase. Is this cpu increase only the case with codec conversions (ulaw to/from g729a)?
My phones support the g729a codec, my sip provider/trunk support g729a natively, and if i install the g729a coded (from digium for example), my pbx server will support g729a. Would this still result in a big cpu hit, or would the increase be much less?