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Avaya IP Telephones implement the Resource ReSerVation Protocol (RSVP) to support WAN bandwidth management. RSVP is administered from the media server. Avaya IP Telephones implement the RTP Control Protocol (RTCP) so that Avaya’s Voice over IP (VoIP) Monitoring Manager (VMON) software can provide real-time monitoring and historical data of the audio quality of VoIP calls.
Resource ReSerVation Protocol (RSVP) is an IETF-standard protocol used by hosts to request resource reservations throughout a network. RSVP-compliant hosts send messages through a network to receivers, which respond with messages requesting a type of service and an amount of resources (e.g., bandwidth) to carry out that service. The host is responsible for admitting (approving) or rejecting (denying) the request. In a QoS context, RSVP is used to try to reserve bandwidth in the network for voice calls, on a call-by-call basis. If insufficient bandwidth is available for the target voice quality, a request to use network bandwidth for a voice call will be rejected.
RTP Control Protocol (RTCP), as its name implies, is a protocol that provides control functions for Real-time Transport Protocol (RTP). RTP provides end-to-end network services for real-time data (such as Voice over IP), but does not provide a reservation function, nor does it guarantee any level of QoS. RTCP supplements RTP by monitoring the quality of the RTP services and can provide real-time information to users of an RTP service. In a QoS context, RTCP is valuable for identifying information such as packet loss, 1-way delay (how long a packet has to go from source A to destination B), jitter, etc. RTCP itself does not improve QoS, but it provides information to help identify where problem areas might be.
You cannot change the telephone’s RSVP or RTCP parameters directly on the telephone or via TFTP or DHCP administration. The only way to change these parameters is by appropriate administration of the switch. See your Avaya Media Server administration material for more detail.
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