Resource Reservation Protocol (RSVP) specifies a resource-reservation, transport-level protocol for reserving resources in IP networks. RSVP provides a method to achieve Call Admission Control (CAC) in addition to location-based CAC. Location-based CAC constitutes a point-to-point CAC mechanism that does not take into account topology changes or multitier topologies, whereas RSVP does consider these topologies. Many customers request a full-mesh network topology for their video conferencing and video telephony environments to match their existing topology. RSVP can manage complex topologies. Location-based CAC supports only hub-and-spoke or point-to-point topologies such as simple Multiprotocol Label Switching (MPLS) any-to-any topologies. Cisco Unified Communications Manager uses an RSVP agent, a Cisco IOS Software-based RSVP proxy with a Skinny Client Control Protocol (SCCP) interface to support RSVP. Cisco Unified Communications Manager communicates with the RSVP agent through a set of SCCP messages. The RSVP agent registers with Cisco Unified Communications Manager as either a Media Termination Point (MTP) or a transcoder device. This course reviews the CAC process that is based on RSVP – including RSVP agent implementation, it describes the characteristics of the three call legs and it outlines the major issues that are experienced with RSVP agents as well as the intercluster RSVP feature. Isolating the source of voice quality issues is one of the most difficult problems that you can face when troubleshooting a Cisco Unified Communications system. Voice quality can be subjective, and data networks are not sensitive to the same impairments or limitations to which voice over data networks are sensitive. This course concludes with a concentration on maintaining the quality of the voice traffic that crosses the data network and focuses on how to troubleshoot voice quality issues.

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