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Last Modified: 2004-02-02
Routing protocols for VoIP allow intermediaries, such as SIP proxies and H.323 gatekeepers, to make call routing decisions based on reachability information learned from peer elements. The iptel group has already defined a protocol, Telephony Routing over IP (TRIP), RFC 3219, which solves one aspect of this problem. Specifically, it handles the case where calls need to be routed between domains. It allows for the exchange of routing information between these providers, so that policies can be applied to the resulting data to create a forwarding information base.
However, this protocol does not address all the scenarios of route information exchange between servers. One important scenario is the propagation of routing information between gateways and the signaling servers in front of them. This is also known as "gateway registration". It allows the signaling server to make a routing decision about which gateway to use based on dynamic information about the gateway resources. Vendors have deployed proprietary solutions for this communications interface. A standard is needed. The group will generate a standards track document that defines a protocol (possibly based on TRIP) for this interface.
TRIP and the gateway registration protocol are orthogonal to the DNS-based mechanisms specified in ENUM and RFC 3264. Those mechanisms are used to translate a URI, representing a name, to an address. If that address is a phone number in the telephone network, trip and tgrep can be used to assist in determining the right route (through various gateways) to that number.
The group will also generate a MIB document for TRIP.
Note that the group is not working on elevating TRIP to Draft Standard at this time.
Deliverables:
1. A proposed standard specification for gateway to server route exchange.
2. A proposed standard TRIP MIB specification, based heavily on the existing BGP-4 MIB documents.
3. A standards track update to the tel URI.
4. Standards track extensions to the tel URI for PSTN interoperability, such as number portability and trunk group identification.
Done | Submit gateway location framework document to IESG for consideration as an RFC. | |
Done | Submit call processing syntax framework document to IESG for consideration as an RFC. | |
Done | Submit call processing syntax document to IESG for consideration as a Proposed Standard. | |
Done | Submit gateway location protocol document to IESG for consideration as an RFC. | |
Done | TRIP MIB Document submitted to IESG for consideration as proposed standard | |
Jun 03 | Gateway to Server Route Exchange document submitted to IESG for consideration as proposed standard. | |
Jul 03 | Tel URI revisions submitted to IESG | |
Sep 03 | Number portability extensions submitted to IESG for consideration as proposed standard | |
Nov 03 | Consider closing |
RFC | Status | Title |
---|---|---|
RFC2824 | I | Call Processing Language Framework and Requirements |
RFC2871 | I | A Framework for a Gateway Location Protocol |
RFC3219 | PS | Telephony Routing over IP (TRIP) |