RFC Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) – User Adaptation Layer (M3UA), September Canonical URL. RFC (part 1 of 5): Signaling System 7 (SS7) Message Transfer Part 3 ( MTP3) – User Adaptation Layer (M3UA). M3UA Overview. Protocol Architecture. Services Provided by the M3UA Layer. Support for the Transport of MTP3-User Messages. Full.

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The M3UA layer at an ASP keeps the state of the routes to remote SS7 destinations and may initiate an audit of the availability rff the restricted or the congested state of remote SS7 destinations. Table of Contents 1. An example scenario is where an SG appears as an. Distribution of this memo is unlimited. Failover also applies upon the return to service of a previously unavailable Application Server Process.

Routing Context – A value that uniquely identifies a Routing Key.

M3UA RFC.4666 – SS7 MTP3 User Adaptation Layer

It serves as an active, backup, load-sharing, or broadcast process of a Signalling Gateway. This is to take advantage of various SCTP features, such as: The AS contains a set of one or more unique Application Server Processes, of which one or more is normally actively processing traffic.

The provisioning and configuration of the SS7 network determines the restriction placed on the maximum block. An SG contains a set of one or more unique Signalling Gateway Processes, of which one or more is normally actively processing traffic. This can be achieved using the. Message Distribution at the SGP Linkset – A number of signalling links that directly interconnect two signalling points, which are used as a module.


Layer Management – Layer Management is a nodal function that handles the inputs and outputs between the M3UA layer and a local management entity. Signalling Process – A process instance that uses M3UA to communicate with other signalling processes.

Signaling Transfer Point STP – A node in the SS7 network that provides network access and performs message routing, screening and transfer of signaling messages.

M3UA – Wikipedia

Stream – An SCTP stream; a unidirectional logical channel established from one SCTP endpoint to another associated SCTP endpoint, within which all user messages are delivered in-sequence except for those submitted to the unordered delivery service.

Managing Routing Contexts and Routing Keys The delivery mechanism should meet the following criteria: Network Byte Order – Most significant byte first, a. Message Classes and Types Examples of M3UA Procedures Message Distribution at the ASP Definition of M3UA Boundaries Routing Key Management Procedures [Optional] However, in the context of an SG, the maximum octet block size must be followed when interworking to a SS7 network that does not support the transfer of larger information blocks to the final destination.

Routing Key – A Routing Key describes a set of SS7 parameters and parameter values that uniquely define the range of signalling traffic to be handled by a particular Application Server.


Receipt of Primitives from the Layer Management Routing Context values are configured either using a configuration management interface, or by using the routing key management procedures defined in this document. This document obsoletes RFC Signalling Point Code Representation Please refer to the current edition of the “Internet Official Protocol Standards” STD 1 for the standardization state and status of this protocol.

However, in the case where an ASP is connected to more than one SG, the M3UA layer at an ASP should maintain the status of configured SS7 destinations and route messages according to the availability and congestion status of the routes to these destinations via each SG.

Protocol Architecture The framework architecture that has been defined for SCN signalling transport over IP [ 12 ] uses multiple components, including a common signalling transport protocol and an adaptation module to support the services expected by a particular SCN signalling protocol from its underlying protocol layer.

Routing Contexts and Routing Keys Network Working Group K. Failover – The capability to reroute signalling traffic as required to an alternate Application Server Process, or group of ASPs, within an Application Server in the event of failure or unavailability of a rvc used Application Server Process. Signalling Gateway SS7 Layers Note that there is a 1:

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