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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The Selective ACK also contains zero or more fragment reports. Interested in more details about testing this protocol? The SCTP user can specify at startup time the number of streams to be supported by the association.

You will have a warm inner glow for the rest of the day. Otherwise the Verification tag is set to all 0’s. If you are happy it’s OK – but your browser is giving a less than optimal experience on our site. Both transport MTP3 messages. User Data Link Status. 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.

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.


In case of network failures, use of more than one address can allow re-routing of packets, and also provide an alternate path for retransmissions.

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

The M2UA header structure is as follows: This parameter therefore acknowledges receipt of all TSNs up to and including the value given. 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. Message Type The following list contains the message types for the defined messages. Message Length Defines the length of the message k3ua octets including the common header.

Problems, comments, suggestions, corrections including broken links or something to add?

This protocol can also support transport of SCCP-user messages between two endpoints wholly contained within an IP network. The delivery mechanism supports:. The chunks contain either control information or user data.

Spare This field should be set to zero. It can be used by the receiver, in combination with the source IP Address, to identify the association to which this datagram belongs.

It must not affect the operation of SCTP. It contains one n3ua more error causes. Message length The message length defines the length of the message in octets, including the common header.

MTP 3 User Adaptation Layer (M3UA)

Please take the time from a busy life to ‘mail us’ at top of screenthe webmaster below or info-support at zytrax. Allows for messages to be delivered in the order in which there were sent. There may also be operational cost and performance advantages when traditional signaling links are replaced by IP network “connections”.

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Messages are handled from point code to point code. Message Length The Message Length defines the length of the message in octets, including the header.

A standard IP layer. A device that converts from one protocol to another.

Tech Stuff – SIGTRAN (SS7 over IP)

The supported version is 1 Release 1. Parameter length Parameter length indicates the size of the parameter in bytes. Version The version field contains the version of the M2UA adapation layer.

The INIT chunk contains the following parameters.

The supported version is 1. Parameter value The value of the parameter. Legal and Privacy site by zytrax web-master at zytrax Page modified: Does not need SCCP services, reducing the complexity of the node and thereby reducing cost. Variable-length parameter format M2UA messages consist of a common header described above followed m3ha zero or more variable-length parameters, as defined by the message type. Needs the SCCP services.

End-points exchange lists of addresses during initiation of the connection. Endpoints that do not receive desired vendor specific information should make an attempt to operate without it, although they may do so and report they are doing so in a degraded mode.