RFC 3219 (rfc3219) - Page 3 of 79
Telephony Routing over IP (TRIP)
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RFC 3219 Telephony Routing over IP (TRIP) January 2002 14 Security Considerations ................................. 70 A1 Appendix 1: TRIP FSM State Transitions and Actions ...... 71 A2 Appendix 2: Implementation Recommendations .............. 73 Acknowledgments ................................................ 75 References ..................................................... 75 Intellectual Property Notice ................................... 77 Authors' Addresses ............................................. 78 Full Copyright Statement ....................................... 79 1. Terminology and Definitions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [1]. A framework for Telephony Routing over IP (TRIP) is described in [2]. We assume the reader is familiar with the framework and terminology of [2]. We define and use the following terms in addition to those defined in [2]. Telephony Routing Information Base (TRIB): The database of reachable telephony destinations built and maintained at an LS as a result of its participation in TRIP. IP Telephony Administrative Domain (ITAD): The set of resources (gateways, location servers, etc.) under the control of a single administrative authority. End users are customers of an ITAD. Less/More Specific Route: A route X is said to be less specific than a route Y if every destination in Y is also a destination in X, and X and Y are not equal. In this case, Y is also said to be more specific than X. Aggregation: Aggregation is the process by which multiple routes are combined into a single less specific route that covers the same set of destinations. Aggregation is used to reduce the size of the TRIB being synchronized with peer LSs by reducing the number of exported TRIP routes. Peers: Two LSs that share a logical association (a transport connection). If the LSs are in the same ITAD, they are internal peers. Otherwise, they are external peers. The logical association between two peer LSs is called a peering session. Rosenberg, et. al. Standards Track
