> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/telecom-references/protocols/m2pa.md).

# M2PA

The *Message Transfer Part 2 Peer-to-Peer Adaptation Layer* (M2PA) is used to replace the [MTP2](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/mtp2/README.md) layer entirely. In contrast with [M2UA](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/sigtran-m2ua/README.md), M2PA does not include MTP2 links between the two point codes; however, it still requires the [MTP3](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/mtp3/README.md) layer.

The following figures show two different configurations of M2PA:

**FIGURE 1:**

![m2pa\_sg\_setup.png](https://docs.telcobridges.com/w/images/d/d7/M2pa_sg_setup.png)

**FIGURE 2:**

![m2pa\_ipsp\_setup.png](https://docs.telcobridges.com/w/images/0/0a/M2pa_ipsp_setup.png)

The first figure includes a setup featuring the signaling gateway as an STP, from the [SS7](https://telcobridges.com/media-gateways/solutions/signaling/migrating-ss7-sigtran/) point of view.

### TelcoBridges and M2PA

TelcoBridges supports M2PA as part of its [SIGTRAN](https://telcobridges.com/media-gateways/solutions/signaling/migrating-ss7-sigtran/) implementation.

### Configuration

*
*

\- \[SS7-M2PA configuration v2.10]\(/tmedia/configuration/tmedia-tdev-and-tsig-web-portal-2-10-protocol-stacks#m2pa-mtp3-isup) - \[SS7-M2PA configuration v2.9]\(/tmedia/configuration/web-portal-2-9-protocol-stacks#m2pa-mtp3-isup) - \[SS7-M2PA configuration v2.8]\(/tmedia/configuration/web-portal-2-8-protocol-stacks#m2pa-mtp3-isup) - \[SS7-M2PA configuration v2.7]\(/tmedia/configuration/tmedia-tsig-and-tdev-web-portal-2-7-tutorial-guide#m2pa-mtp3-isup)

### References

* [Article at Protocols.com](http://www.protocols.com/pbook/sigtran.htm#M2PA)
* RFC 4165 Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) - User Peer-to-Peer Adaptation Layer (M2PA)


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