> For the complete documentation index, see [llms.txt](https://tmediadocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tmediadocs.telcobridges.com/telecom-references/ss7-and-signalling/sigtran/m2pa.md).
# M2PA
M2PA, the MTP2 peer-to-peer adaptation layer: how it replaces MTP2 entirely to carry SS7 links over IP, and how it differs from M2UA.
The *Message Transfer Part 2 Peer-to-Peer Adaptation Layer* (M2PA) is used to replace the [MTP2](/telecom-references/ss7-and-signalling/mtp2.md) layer entirely. In contrast with [M2UA](/telecom-references/ss7-and-signalling/sigtran/sigtran-m2ua.md), M2PA does not include MTP2 links between the two point codes; however, it still requires the [MTP3](/telecom-references/ss7-and-signalling/mtp3.md) layer.
The following figures show two different configurations of M2PA:
**FIGURE 1:**
**FIGURE 2:**
The first figure includes a setup featuring the signaling gateway as an STP, from the [SS7](/telecom-references/ss7-and-signalling/ss7.md) point of view.
### TelcoBridges and M2PA
TelcoBridges supports M2PA as part of its [SIGTRAN](/telecom-references/ss7-and-signalling/sigtran.md) implementation.
### Configuration
* [SS7-M2PA configuration v3.2](https://tmediadocs.telcobridges.com/configuration/web-portal-previous/web-portal-3-2/protocol-stack/protocol-stack-settings#ss7-isup)
* [SS7-M2PA configuration v3.0](https://tmediadocs.telcobridges.com/other-pages/protocol-stacks-general/tmedia-tdev-and-tsig-web-portal-3-0-protocol-stacks#ss7-isup)
Click here for other versions
* [SS7-M2PA configuration v2.10](https://tmediadocs.telcobridges.com/configuration/web-portal-previous/web-portal-2-10/tmedia-tdev-and-tsig-web-portal-2-10-protocol-stacks#ss7-isup)
* [SS7-M2PA configuration v2.9](https://tmediadocs.telcobridges.com/configuration/web-portal-previous/web-portal-2-9/web-portal-2-9-protocol-stacks#ss7-isup)
* SS7-M2PA configuration v2.8 and earlier: documentation is no longer published. Contact [technical support](https://tmediadocs.telcobridges.com/operations-and-support/support/contacting-telcobridges-technical-support) if you need it.
### 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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