> 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/m3ua.md).
# M3UA
M3UA, the MTP3 user adaptation layer: the four ways it is deployed, from extending an MTP3 link to replacing MTP3 and MTP2 outright.
The M3UA (Message Transfer Part 3 User Adaptation Layer) layer can be used like this:
* extend an [MTP3](/telecom-references/ss7-and-signalling/mtp3.md) link
* replace the [MTP3](/telecom-references/ss7-and-signalling/mtp3.md) and [MTP2](/telecom-references/ss7-and-signalling/mtp2.md) layers entirely
* do a signaling gateway (SG) with a shared point code
* do a signaling gateway (SG) to another signaling gateway with a shared point code
Here are some examples:
**FIGURE 1:**
**FIGURE 2:**
### TelcoBridges and M3UA
TelcoBridges supports M3UA as part of its support for SIGTRAN.
### Sigtran use cases
You can see some use cases for Sigtran here: [Sigtran use cases](https://tmediadocs.telcobridges.com/configuration/web-portal-3-3/use-cases/redirect/sigtran-configuration) and [M3UA Configurations](https://tmediadocs.telcobridges.com/configuration/web-portal-3-3/use-cases/m3ua/use-cases-m3ua-configuration)
### Configuration
* [M3UA configuration v3.2](https://tmediadocs.telcobridges.com/configuration/web-portal-previous/web-portal-3-2/protocol-stack/protocol-stack-settings#sigtran)
* [M3UA configuration v3.0](https://tmediadocs.telcobridges.com/other-pages/protocol-stacks-general/tmedia-tdev-and-tsig-web-portal-3-0-protocol-stacks)
Click here for other versions
* [M3UA 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)
* [M3UA configuration v2.9](https://tmediadocs.telcobridges.com/configuration/web-portal-previous/web-portal-2-9/web-portal-2-9-protocol-stacks)
* M3UA 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#m3ua)
* [Wikipedia article](http://en.wikipedia.org/wiki/M3UA)
* RFC 4666 Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User Adaptation Layer (M3UA)
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