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When an enterprise's existing IP-PBX needs to be extended with extensions, users can choose two approaches:
-Directly with IP phones: fast deployment, no phone lines to pull; more costly
-Using an analog VoIP gateway and analog phones, which is more economical
This article describes the second way, which is to help the IP-PBX expand the extensions by using an MX VoIP gateway with FXS port to access the analog phones.
The extended analog extensions can make direct calls to and from the IP extensions, can make and receive external calls via trunk lines on the IP-PBX and can use the various communication features of the IP-PBX
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