M2UA, MTP2-User Adaptation

Protocol suite:	TCP/IP.
Type:	Application layer protocol.
Port:	2904 (SCTP, TCP).
MIME subtype:
SNMP MIBs:
Working groups:
Links:

MAC header	IP header	SCTP header	M2UA header	Data :::
MAC header	IP header	TCP header	M2UA header	Data :::

M2UA header:

00	08	16	24
Version	0	Class	Type
Length
Data :::

Version. 8 bits.
Version number of this protocol.

Class. 8 bits.
Message class.

Class	Description
0	MGMT, Management message.
1	Transfer message.
2	SSNM, SS7 Signalling Network Management message.
3	ASPSM, ASP State Maintenance message.
4	ASPTM, ASP Traffic Maintenance message.
5	QPTM, Q.921/Q.931 Boundary Primitives Transport message.
6	MAUP, MTP2 User Adaptation message.
7	Connectionless message.
8	Connection-Oriented message.
9	RKM, Routing Key Management message.
10	IIM, Interface Identifier Management message.
11 - 127	reserved.
128 - 255	reserved for IETF-Defined Message Class extensions.

Type. 8 bits.
Message type.

Type	Description
0	reserved.
1	Data.
2	Establish Request.
3	Establish Confirm.
4	Release Request.
5	Release Confirm.
6	Release Indication.
7	State Request.
8	State Confirm.
9	State Indication.
10	Data Retrieval Request.
11	Data Retrieval Confirm.
12	Data Retrieval Indication.
13	Data Retrieval Complete Indication.
14	Congestion Indication.
15	Data Acknowledge.
16 - 127	reserved.
128 - 255	reserved for IETF-Defined MAUP extensions.

Length. 32 bits.
Size of the message in bytes, including the header. The length MUST include parameter padding bytes, if any. The length MUST NOT be longer than a MTP3 message plus the length of the common and M2UA message headers.

Data. Variable length.

Glossary:

RFCs:

[RFC 3331] Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) - User Adaptation Layer.

Category: Standards Track.
Defines SCTP Payload Protocol Identifier 2 (M2UA).