> 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/sccp-routing.md).

# SCCP Routing

The [SCCP](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/sccp/README.md) software routes data based on:

* [DPC](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/signalling/dpc/README.md) + [SSN](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/parameters/sub-system-number/README.md)
* DPC + [global title](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/concepts/global-title/README.md)
* DPC + global title + SSN
* Global title
* Global title + SSN
* ISNI + Global title (Valid only for ANSI 96 and GR-246-CORE Issue 5).
* INS + Global title (Valid only for GR-246-CORE Issue 5).

When a message is received from SCCP user (upper layer), the point code determines whether the message is processed further locally or sent to a remote node.

When a message is received from [MTP Level 3](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/mtp3/README.md) (lower layer), the point code is ignored, and the routing indicator determines whether global title translation is required or the message is passed to an SCCP user. Global title translation can result in a remote point code.

SCCP can perform routing based on the ISNI parameter as specified in T1.112.4 (ANSI 1996, GR246-CORE Issue 5, December 2000-Telcordia). SCCP can perform routing based on INS parameter as specified in T1.112.4 (GR246-CORE Issue 5, December 2000 -Telcordia).


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