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This nugget shows how to setup an external extension using direct SIP.
Using the VoIP client as an example it walks you through the process of configuring extensions that reside outside your LAN.

Want to learn more?

Download The 3CX Brochure

Download The 3CX Phone System v.7 Manual

Download The 3CX Extension Manual

Download The 3CX VoIP Client / Soft Phone Manual