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When an enterprise's existingIP-PBX needs to be extended with extensions, users can choose two approaches:
- Directly with IP phones: fastdeployment, no phone lines to pull; more costly
- Using an analog VoIP gateway andanalog phones, which is more economical
This article describes the secondway, which is to help the IP-PBX expand the extensions by using an MX FXS VoIPgateway to access the analog phones.
The extended analog extensions canmake direct calls to and from the IP extensions, can make and receive externalcalls via trunk lines on the IP-PBX and can use the various communicationfeatures of the IP-PBX

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