> 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/products/tmedia/features-and-solutions/features/redundancy-and-high-availability/software-signaling-stack-cas.md).

# Software:Signaling Stack:CAS

### High Availability

#### Live Reconfiguration

With Toolpack, it is possible to add/modify/remove any [CAS](https://tmediadocs.telcobridges.com/telecom-references/ss7-and-signalling/cas) stacks without needing to stop the whole system.

#### Redundancy

The [CAS](https://tmediadocs.telcobridges.com/telecom-references/ss7-and-signalling/cas) protocol doesn't have an innate high availability feature. The only way to increase the reliability of a system using [CAS](https://tmediadocs.telcobridges.com/telecom-references/ss7-and-signalling/cas) is to mix the stacks between the provider and the Tdev hardware, when available.

Here is an example:

![Cas Ha Distribution](https://docs.telcobridges.com/w/images/b/ba/Cas_Ha_Distribution.png)


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