It looks like Voice quality is more and more frequently embedded in phones themselves, mostly with RTCP statistics.
I've understood RFC3550 is a first step and RFC3611 goes one step further with MOS and R-factor mesurement.
I suppose that best practices should include a way to monitor those Voice quality statistics from a monitoring hub and trigger call routing to improve voice quality when desirable.
I'm not aware of any SIP hardphone complying to RFC3611 though a couple of SIP softphones claim to.
Among those softphone, I'm aware of Counterpath's eyeBeam (which embed Telchemy VQMon software) and Kapanga.
I think I once contacted Telchemy to know SIP hardphone vendors they dealed with but couldn't get any reply.
So, that leaves RFC3550 compliant hardphones.
I think Cisco's are RFC3550 compliant.
Hope this helps ...
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