Signaling Transport (sigtran) ----------------------------- Charter Last Modified: 2006-03-24 Current Status: Active Working Group Chair(s): Lyndon Ong Real-time Applications and Infrastructure Area Director(s): Jon Peterson Cullen Jennings Real-time Applications and Infrastructure Area Advisor: Cullen Jennings Technical Advisor(s): Shawn Routhier Mailing Lists: General Discussion:sigtran@ietf.org To Subscribe: sigtran-request@ietf.org In Body: subscribe email_address Archive: http://www.ietf.org/mail-archive/web/sigtran/index.html Description of Working Group: The primary purpose of this working group will be to address the transport of packet-based PSTN signaling over IP Networks, taking into account functional and performance requirements of the PSTN signaling. For interworking with PSTN, IP networks will need to transport signaling such as Q.931 or SS7 ISUP messages between IP nodes such as a Signaling Gateway and Media Gateway Controller or Media Gateway. Examples of such transport include: - transport of signaling between a Signaling Gateway and Media Gateway or Media Gateway Controller - transport of signaling ("backhaul") from a Media Gateway to a Media Gateway Controller - transport of TCAP between a Signaling Gateway and other IP nodes Applications include: - Internet dial-up remote access - IP telephony interworking with PSTN - Other services as identified Specific goals are: 1. Architecture and Performance Requirements: The working group will produce an informational RFC identifying functionality and performance requirements to support signaling over IP. Signaling messages have very stringent loss and delay requirements in the existing telephone networks that need to be supported. 2- Transport: The working group will produce a standards track proposal or proposals defining transport of signaling protocols using SCTP, based on the requirements identified above. These proposals will identify the method of encapsulation of different signaling protocols. This will include differentiating between different protocols being carried, and what components are transported, translated or terminated at the SG. Security and resilience must be addressed. Note: TCAP is a transaction protocol with different functions and requirements than call control signaling. This will need to be taken into account in its mapping to IP networks. This work will be done in conjunction with other IETF working groups looking at similar issues. The working group will also ensure that good information conduits exist with groups in other standards groups with expertise in the relevant signaling protocols or in the network requirements for the transport of the relevant signaling protocols. The group will make use of existing IETF QoS and security technology and will not address creation of new QoS or security functions for IP networks. Nor will the working group work on defining new call control or device control protocols. Goals and Milestones: Done Submit Initial draft of Signaling Architecture and Performance Requirements document as an Internet-Draft Done Issue initial IDs on Transport Layer Protocols and Encapsulation of Signaling Protocols Done Submit requirements document to IESG for publication as an RFC Done Submit revised version of drafts incorporating discussions and early implementation experience. Done Submit IP-based transport protocol draft to IESG for publication as a Standards-track RFC Done Submit initial adaptation drafts to IESG for consideration as a Proposed Standard Done Submit protocol Applicability Statements draft to IESG for consideration as an Informationl RFC Done Submit protocol MIB draft to IESG for consideration as an Proposed Standard Done Submit security framework to IESG for consideration as Proposed Standard Done Resubmit updated IUA specification to IESG for consideration as proposed standard Done Submit remaining adaptation drafts to IESG for consideration as a Proposed Standard Mar 2004 Submit implementation guidelines and other extensions based on testing to IESG for consideration as Proposed Standard Internet-Drafts: No Current Internet-Drafts. Request For Comments: RFC Stat Published Title ------- -- ----------- ------------------------------------ RFC2719 I Oct 1999 Architectural Framework for Signaling Transport RFC2960 PS Nov 2000 Stream Control Transmission Protocol RFC3057 PS Feb 2001 ISDN Q.921-User Adaptation Layer RFC3257 I Apr 2002 Stream Control Transmission Protocol Applicability Statement RFC3331 PS Sep 2002 Signaling System 7 (SS7) Message Transfer Part (MTP)2 - User Adaption Layer RFC3332 PS Sep 2002 SS7 MTP3-User Adaptation Layer (M3UA) RFC3807Standard Jun 2004 V5.2-User Adaption Layer (V5UA) RFC3788Standard Jun 2004 Security Considerations for SIGTRAN Protocols RFC3873Standard Sep 2004 Stream Control Transmission Protocol Management Information Base RFC3868Standard Oct 2004 Signalling Connection Control Part User Adaptation Layer (SUA) RFC4165Standard Sep 2005 Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) - User Peer-to-Peer Adaptation Layer (M2PA) RFC4129Standard Oct 2005 Digital Private Network Signaling System (DPNSS)/Digital Access Signaling System 2 (DASS 2) Extensions to the IUA protocol RFC4233Standard Jan 2006 Integrated Services Digital Network (ISDN) Q.921-User Adaptation Layer RFC4166 I Feb 2006 Telephony Signalling Transport over Stream Control Transmission Protocol (SCTP) Applicability RFC4666 PS Sep 2006 Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User Adaptation Layer (M3UA)