Nortel Networks Mediant TP-1610 SIP - Manual (Page 231)

Mediant 2000 SIP User’s Manual J. SS7 Tunneling
Version 4.4 231 July 2005
Appendix J SS7 Tunneling
The Signaling System 7 (SS7) tunneling feature facilitates peer-to-peer transport of SS7 links
between gateways that support AudioCodes' unique MTP2 (Message Transfer Part) Tunneling
application (M2TN) for transferring SS7 MTP2 link data over IP. In this scenario, both sides of
the link are pure TDM switches and are unaware of the IP tandem that is utilized between them.
Using M2TN, the network operator can support SS7 connections over IP, carrying MTP level 3,
as well as higher level SS7 layers (e.g., user parts and application protocols, such as TUP
(Telephone User Part), Integrated ISUP (Services User Part), SCCP (Signaling Connection
Control Part), TCAP (Transaction Capabilities Application Part), etc.).
M2TN uses standard protocols, such as SIGTRAN (RFC 2719 Architectural Framework for
Signaling Transport), SCTP (RFC 2960, Stream Control Transmission Protocol), M2UA (RFC
3331, MTP2 User Adaptation Layer), the latter being used for transporting SS7-MTP2 signaling
information over IP. M2UA architecture is shown in
Figure J-1 . M2TN architecture is shown in
Figure J-2 .
Figure J-1: M2UA Architecture
Figure J-2: M2TN Architecture