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Combination of PJP-50USB + softphone
An IP-PBX and SIP server can assign extension numbers to each PJP-50R. You can call other conference participants by dialing their extension numbers instead of their IP addresses.

No matter what floor, conference room, or desk, as long as you use the same network you can use the same extension number even when the IP address changes.

Using the VS-32 (an SV8500 peripheral) which controls multipoint connections, you can hold conferences with up to 32 locations simultaneously.

An IP-PBX and SIP server connect with external lines to enable participants to join a conference through the telephone, without needing audio conferencing system terminals.
UNIVERGE Certified page(Japanese)
http://www.nec.co.jp/univerge/univergepartner/product/100250/100250_1.html
Support for UNIVERGE is included on firmware version 2.02 for the PJP-50R. Firmware versions prior to these will not work-please download the latest firmware at the following URL.
http://www.yamaha.co.jp/english/product/projectphone/support/download/firmware/index.html
Support for UNIVERGE is included on firmware version 2.10 for the PJP-50R.Firmware version prior to this will not work-please download the latest firmware at the following URL.
http://www.yamaha.co.jp/english/product/projectphone/download/firmware/index.html#pjp50r