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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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Message length The message length defines the length of the message in octets including the header and includes parameter padding bytes if there are any. The following is the format of the SCTP header:. Heartbeat Request HEARTBEAT An endpoint should send this chunk to its peer endpoint m3ux the current association to probe the reachability of a particular destination transport address defined in the present association. In these networks, there may be some need for interworking between the SS7 and IP domains.

Otherwise the Verification tag is set to all 0’s. pprotocol

Please take the time from a busy life to ‘mail us’ at top of screenthe webmaster below or info-support at zytrax. Chunk Flags The type of chunk flag as defined in the chunk ID defines whether these bits will be used. The supported version is 1 – Release 1. This protocol can also support transport of SCCP-user messages between two endpoints wholly contained within an IP network. Message length The message length defines the length of the message in octets, including the protoclo header.

The values of the chunk ID are defined as follows: 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.


Problems, comments, suggestions, corrections including m3ia links or something to add? Spare This field should be set to zero. Variable-length parameters M3UA messages consist of a common header followed by zero or more variable-length parameters, as defined by the message type.

The chunks contain either control information or user data. The Abort chunk may contain cause parameters to inform the receiver the reason for the abort. SG is an SS7 node with a point code. Interested in more details about testing this protocol?

Parameter length Parameter length indicates the size of the parameter in bytes. The M3UA header structure is as follows:. 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.

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

If the receiver receives a datagram with an all-zeros Verification tag field, it checks the Chunk ID immediately following the common header. Message Type The following list contains the message types for the defined messages.

SG is not an SS7 node and has no point code. Verification Tag The receiver of this 32 bit datagram uses the Verification tag to identify the association.

SCN signaling nodes would have access to databases and other devices in the IP network domain that do not use SS7 signaling links.

Defined by RFC M2UA format of variable-length parameters. M3UA format of variable-length parameters. Likewise, IP telephony applications would have access to SS7 services. Message class The values for message class can be any of the following:. The SCTP datagram is comprised of a common header and chunks.


Each user application might be assigned its own stream virtual connection. Message Length Defines the length of the message in octets including the common header. The supported version is 1 Release 1. On transmit, the value of this Verification tag must be set to the value of the Initiate tag received from the peer endpoint during the association initialization.

Parameter value The value of the parameter. Does not need SCCP services, reducing the complexity of the node and thereby reducing cost.

The format of variable-length parameters is as follows:. It is a ‘glue’ layer and its functionality is not defined by the standards. It uses two extra variable parameters: The protocol consists of a common message header followed by parameters as defined by the message type. 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.

The Responder Cookie and the Unrecognized Parameter.

Tech Stuff – SIGTRAN (SS7 over IP)

Both transport MTP3 messages. SG can have upper SS7 mua, e. Reserved This field should be set to zero. IP provides an effective way to transport user data and for operators to expand their networks and build new services.

If you are happy it’s OK – but your browser is giving a less than optimal experience on our site. SCTP uses periodic heart-beat messages to confirm the status of each end point.