Sending 603 Declined to Voicemail

[tony722]

When a Polycom phone is ringing, one of the softkeys is "Reject". When pressed, this issues a "601/Declined" by default.

The problem is that when this button is pressed the caller hears: "call forbidden by administrator". I would prefer that the caller gets transferred to voicemail. Is there a setting that would enable this?

Log entry:
30/05/2017 19:47:28:328 | [CM503003]: Call(C:25): Call to <sip:[email protected]:5060> has failed; Cause: 603 Decline/INVITE from 10.2.2.143:5060

3CX System Version: 15.0.62928.5
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Thanks!

Tony