M3UA seamlessly transports SS7 MTP3 user part signaling messages over IP using SCTP. M3UA-connected IP endpoints do not have to conform to standard. MTP 3 User Adaptation Layer (M3UA). Member of the SIGTRAN protocol family. XXX – add a brief M3UA description here. The following SIGTRAN protocols in this section: IUA. M2PA, MTP2 User Peer-to- Peer Adaptation Layer. M2UA, MTP2 User Adaptation Layer. M3UA, MTP3.

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SCN signaling nodes would have access to databases and other devices in the IP network domain that do not use SS7 signaling links. Version The version field contains the version of the M3UA adapation layer.

If the receiver receives a datagram with an all-zeros Verification tag field, it checks the Chunk ID immediately following the common header.

M3UA Protocol

M2UA format of variable-length parameters. One address is designated as the primary address to receive data. Variable-length parameters M3UA messages consist of a common header followed by zero or more variable-length parameters, as defined by the message type.

SG’s single function is to relay MTP3 messages.

The whole IP network is represented by a single point code that addresses the MGC at the network edge. This includes message transfer between the following: The variable-length parameter format is as follows:.

MTP 3 User Adaptation Layer (M3UA)

The INIT chunk contains the following parameters. Problems, comments, suggestions, corrections including broken links or something to add? Message Length The Message Length defines the length of the message in octets, including the header. Allows for multiple virtual connections on the same physical line.


M3UA – Wikipedia

It uses two extra variable parameters: Protoxol chunks are not bundled with the abort, control chunks may be bundled with an abort, but must be placed before the abort in the SCTP datagram or they will be ignored. Interested in more details about testing this protocol? This protocol can also support transport of SCCP-user messages between two endpoints wholly contained within an IP network. The supported version is 1. Each IPSP must have its own point code.

Message class The values for Message class can be any of the following:. The design of SCTP includes appropriate congestion avoidance behaviour and resistance to flooding and masquerade attacks.

The Responder Cookie and the Unrecognized Parameter. Each user application might be assigned its own stream protodol connection. The architecture that has been defined protocok SCN signaling transport over IP uses multiple components, including an IP transport protocol, a signaling common transport protocol and an adaptation module to support the services expected by a particular SCN signaling protocol from its underlying protocol layer.

Selective Acknowledgement SACK This chunk is sent to the remote endpoint to acknowledge received Data chunks and to inform the remote endpoint of gaps in the received subsequences of Data chunks as represented by their TSNs.


SCTP is an application-level datagram transfer protocol operating on top of an unreliable datagram service such as UDP. Verification Tag The receiver of this 32 bit datagram uses the Verification tag to identify the association. Defined by RFC IP provides an effective way to transport user data and for operators to expand their networks and build new services.

There may also be operational cost and performance advantages when traditional signaling links are replaced by IP network “connections”.

RFC – Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) – User Adaptation Layer (M3UA)

This chunk precedes any Data chunk sent within the association, but may be bundled with one or more Data chunks in the same SCTP datagram. Messages are handled from point code to protoocol code. Variable-length parameter format M2UA messages consist of a common header described above followed by zero or more variable-length parameters, as defined by the message type.

SCTP’s multi-streaming allows data to be delivered in multiple, independent streams, so that if there is data loss in one stream, delivery will not be affected for the other streams.