> 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/isdn-and-cas/tandem-switching.md). # Tandem switching Tandem switching consists of non-customer-facing switches that are configured to route traffic amongst themselves or to other switches for such purposes as capitalizing on cheap international long-distance, etc. ### TelcoBridges and Tandem switching TelcoBridges' [Tmedia](https://telcobridges.com/media-gateways/products/tmedia-gateways/) and [Tdev](https://telcobridges.com/products/development-platforms-tdev/) devices can act as Class 4 switches, providing tandem switching among Class 5 devices at the local level. They offer a very cost-effective approach to building out footprint, consolidating call volumes. Tdev and Tmedia devices are distinguished by high levels of customizability and faster turnaround on adding new features. The included Toolpack development software also allows operators to write and implement critical features that are unique to their business. Tdev and Tmedia devices also provide much flexibility, enabling operators to mix and match interface and signaling protocols, including [SS7](https://telcobridges.com/media-gateways/solutions/signaling/migrating-ss7-sigtran/), [ISDN](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/isdn/README.md), [CAS R2](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/cas/README.md), [SIP](https://telcobridges.com/learning/sip-trunking/what-is-sip/), and [SIGTRAN](https://telcobridges.com/media-gateways/solutions/signaling/migrating-ss7-sigtran/) in the same box, with no need for additional dedicated hardware. Finally, they offer cost-conscious operators a platform that is recognized as a leader in energy efficiency and green operation. ### References * [Wikipedia article](http://en.wikipedia.org/wiki/Class_4_telephone_switch) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://prosbcdocs.telcobridges.com/telecom-references/isdn-and-cas/tandem-switching.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.