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Polycom Quad Bri Module for VSX7000S & Vsx 7000 Questions & Answers
What does QUAD BRI stand
It means that there are four ISDN BRI S/T interfaces on the device. Each BRI line contains two phone numbers at 64Kbps of bandwidth each so the Quad BRI would supply 128Kbps x 4 or 512Kbps of bandwidth.
Polycom voicestation 300
are you sure this feature is not blocked on your line? check with another phone connected to the same socket if you can dial the same numbers
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