M2UA

The M2UA (Message Transfer Part 2 User Adaptation Layer) is used to interface MTP2 of the signaling gateway to the MTP3 of a media gateway controller. M2UA can also be seen as way to extend a MTP2 link. An M2UA link is always bound to an MTP2 link.

Here is a diagram of a setup using M2UA:

As you can see the M2UA layer can interface with either a NIF or MTP3 layer. Therefore M2UA has 2 modes of operation. Toolpack can configure M2UA in both modes.

TelcoBridges and M2UA

TelcoBridges supports M2UA as part of its SIGTRAN implementation.

References

• Article at Protocols.com
• RFC 3331 Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) - User Adaptation Layer