Only 1 of 2 registered contacts receiving the call
 

Hello

This is my setup:

1. sip.mysipswitch.com is registered to eu.voxalot.com, there are some rules in mysipswitch to forward the call to PSTN number;
2. Nokia E60 is registered to us.voxalot.com with the same account as above

Now I'm making the incoming call to this voxalot account, either from the SIP phone or from PSTN access number.
If both registrations are active then only mysipswitch is getting the call, no ring on Nokia.
If Nokia is the only registered contact - then no problem, Nokia rings.

If both registered to the same server us.voxalot.com - no problem. Is this a strong requirement for such setup to work?

Thanks.