> For the complete documentation index, see [llms.txt](https://support.portsip.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.portsip.com/portsip-communications-solution/portsip-pbx-administration-guide/8-call-route-management.md).

# 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](/portsip-communications-solution/portsip-pbx-administration-guide/8-call-route-management/configuring-inbound-rule.md)
* [Configuring Outbound Rule](/portsip-communications-solution/portsip-pbx-administration-guide/8-call-route-management/configuring-outbound-rule.md)