> 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/voice-and-media/asr.md).

# ASR

Answer Seizure Ratio (ASR) provides the relationship between the number of seizures that result in an answer signal and the total number of seizures. This is a direct measure of the effectiveness of the service being offered and is usually expressed as a percentage as follows:

```
ASR = (Seizures resulting in answer signal) / (Total seizures) * 100
```

In the case of [call routing](/telecom-references/developer-reference/routing-scripts/call-routing.md), using the TelcoBridges' Media Gateway Application, ASR routing will match any route whose destination NAP has a higher ASR. This kind of routing will try to improve the overall system ASR by always using the best [NAP](/telecom-references/sip-and-voip/sip/nap.md).

The TelcoBridges' Media Gateway Application can decide to route on the best NAP according to the following time periods:

* global
* last\_24h
* current\_hour
* last\_hour

The TelcoBridges' Media Gateway Application can also decide upon a minimum ASR under which the NAP will not be used anymore.

:Category:RevisionV2


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