| M2PA, MTP2 User Peer-to-peer Adaptation Layer |
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Description | Glossary | RFCs | Publications | Obsolete RFCs |
| Protocol suite: | SS7, TCP/IP. |
| Protocol type: | Application layer protocol. |
| Ports: | 3565 (SCTP). |
| MIME subtype: | |
| SNMP MIBs: | |
| Working groups: | |
| Links: |
| MAC header | IP header | SCTP header | M2PA header | Data ::: |
M2PA header:
| 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Version | reserved | Message Class | Message Type | ||||||||||||||||||||||||||||
| Message Length | |||||||||||||||||||||||||||||||
| reserved | BSN, Backward Sequence Number | ||||||||||||||||||||||||||||||
| reserved | FSN, Forward Sequence Number | ||||||||||||||||||||||||||||||
| Data ::: | |||||||||||||||||||||||||||||||
Version.
8 bits.
Version of this protocol.
reserved.
8 bits.
SHOULD be cleared to zero by the sender and ignored by the receiver.
This field SHOULD NOT be used for proprietary information.
Message class. 8 bits.
| Class | Description | References |
|---|---|---|
| 11 | M2PA message | RFC 4165 |
Message type. 8 bits.
| Type | Description | References |
|---|---|---|
| 1 | User data. | RFC 4165 |
| 2 | Link status | RFC 4165 |
Message length.
32 bits.
Size of the message in bytes including the header fields.
BSN, Backward Sequence Number.
24 bits.
The FSN of the message last received from the peer.
FSN, Forward Sequence Number.
24 bits.
Sequence number of the User Data message being sent.
Data. Variable length.
RFCs:
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Description | Glossary | RFCs | Publications | Obsolete RFCs |