Forward missed calls to another number?

[JmsCrk]

I have an account with GoTalk and I have set up voxalot to ring two SPA942 phones (small office situation).

Works fine BUT if neither phone is answered the call is directed to Voxalot's voicemail.

I would prefer that missed calls are sent to my mobile phone.

On the SPA942 it has a call forwarding feature for missed calls that works correctly if I have the phone connected directly to gotalk but not when going through voxalot.

Can I either:

1. Disable voxalot's voicemail and let the SPA942 forward the call to the number it has stored (like happens when directly connected to gotalk)?

2. Make voxalot forward missed calls to another number (and connect the call through my gotalk account)?

Either way I don't care, but I'd love to know how to do this.