connect two ATA's to one voxalot account

[mario]

Hello,

I had tested this configuration, but without succes.
- one voxalot account (15$)
- two ATA (siemens gigaset C450IP) connected to the same account

Now, only one ATA rings when an inbound call arrives.

My question is: is it possible that both ATA's ring, a the first that picks up the phone has the call.

Then I tried, next configuration:
- one voxalot account (15$)
- one voxalot account free
- two ATA (siemens gigaset C450IP); each connected to another account

I tried to set up call forwarding on weekdays between 9:00 and 16:00 from one voxalot account to the other.
So when I choose SIP URI, and I fill in sip:xxxxxx@eu.voxalot.com, I get the message "This Sip URI is invalid".

Can somebody help me?

thanks,

mario