Hello, 

The freeMate DH-011U is not compatible with Polycom VVX models. It is compatible with the following : 

- Avaya : 1408,1416, 4610, 4620, 4621, 5610, 5620, 5621, 5410, 5420

- Yealink : T19, T20, T21, T22, T23, T26, T27, T28

- Alcatel-Lucent : 4018, 4019, 4039, 4001, 4003, 4010, 4012, 4020, 4035

- Temporis : 500, 700, 350, 300, 150, 25pro

- Compatible with most analogue phones

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