Polycom Vortex EF2241 Application Note

To test the output of the codec, select A/V B
OARD-GENERATED 1 KHZ TONE and raise the OUTPUT VOLUME sliders
so that they are even with the third tick mark from the top. This represents approximately -12 dB.
LOOPBACK TESTING
In order to run this test you simply press the Call Add Button as you would with any other test call and you
dial a string 0000000 (Seven Zeros) and then press the Call Now Button. At this point the call will negotiate
and you will see and hear yourself in a Loopback.
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Polycom Vortex EF2241 Specifications

General

Brand	Polycom
Model	Vortex EF2241
Category	Telephone Accessories
Language	English