# 8 Call Route Management

Outbound and inbound rules define how PortSIP PBX routes calls based on specific criteria. With these rules, you can control which trunk is used for a call—for example, to implement **Least Cost Routing (LCR)**, where the PBX selects the lowest-cost route that meets your requirements.

You can also assign **DIDs (Direct Inward Dialing numbers)** so external callers can reach a specific extension (or other destination) directly, without going through a receptionist or IVR.

This article includes the following topics:

* [Configuring Inbound Rule](https://support.portsip.com/portsip-communications-solution/portsip-pbx-administration-guide/8-call-route-management/configuring-inbound-rule)
* [Configuring Outbound Rule](https://support.portsip.com/portsip-communications-solution/portsip-pbx-administration-guide/8-call-route-management/configuring-outbound-rule)


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