Cisco IPT voice quality links

http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/phones/ps379/ps8537/prod_white_paper0900aecd806fa57a.html http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00800b6710.shtml