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Quality of Service (QoS) is a term covering several initiatives to maximize the quality of the voice heard at both ends of a call that originates and/or terminates, on an IP-based telephone. These initiatives include various prioritization schemes to offer voice packets a larger or prioritized share of network resources. These schemes include standards such as IEEE’s 802.1D and 802.1Q, the Internet Engineering Task Force’s (IETF’s) “Differentiated Services,” RTP Control Protocol (RTCP), Resource ReSerVation Protocol (RSVP), and port-based priority schemes such as UDP port selection. Documentation for your LAN equipment will elaborate on the extent your network can support any or all of these initiatives. See Server Administration, for some implications of QoS for the 4600 Series IP Telephones.
As of Release 1.7, both the 4620 and 4630 families of IP Telephones provided network audio quality information to the end user that may be of use to the LAN Administrator. As of Release 1.8, all 4600 Series IP Telephones provide some level of detail about network audio quality. For specific information, see Network Audio Quality Display on 4600 Series IP Telephones.
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