---
title: "Rhino TAS app: Least Cost Routing"
description: This application enables service providers to reduce the transmission costs for calls carried and messages delivered by third parties, and to determine which operator hosts a particular non-geographic number and route the call accordingly.
image: https://www.metaswitch.com/hubfs/Charts-Diagrams/rhino-tas-app-least-cost-routing.png
---

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# Rhino TAS app: Least Cost Routing

### Topics

- [Mobile](https://www.metaswitch.com/knowledge-center/reference/topic/mobile),
- [Rhino TAS](https://www.metaswitch.com/knowledge-center/reference/topic/rhino-tas),
- [Rhino TAS apps](https://www.metaswitch.com/knowledge-center/reference/topic/rhino-tas-apps)

### Developed by a Rhino TAS customer.

This application enables service providers to reduce the transmission costs for calls carried and messages delivered by third parties, and to determine which operator hosts a particular non-geographic number and route the call accordingly.

![rhino-tas-app-least-cost-routing](https://www.metaswitch.com/hs-fs/hubfs/Charts-Diagrams/rhino-tas-app-least-cost-routing.png?width=1394&name=rhino-tas-app-least-cost-routing.png)

This application routes calls according to rules that are held in an internal data store. Routing may be determined by the operator that hosts a particular non-geograohic number. Or it may be to minimize transmission cost, by considering the location of the called party, the time of day, day of week, call-minute volume usage, and tariffing rules. The application typically determines the preferred lowest-cost route and also determines a fall-back choice to support route-failure handling when the preferred routing is unavailable.

Operators adopt this service as part of their primary business model, to offer a wholesale, least-cost routing service. ISPs adopt it to offer a value-added telephony service to new and existing clients.

Rhino TAS operator customers have implemented the following:

- Least Cost Routing
- International Dynamic Routing (where prices vary over time)
- Originator location-dependent Routing
- Non-geographic National Number Plan Routing

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