The method Martin suggested above should work. I checked a very similar set-up.
Forwarding in Voxalot works extremely well generally, but the providers involved may impose their own rules and limitations.
Some other things to consider :
1) Set Voipstunt to "Unregistered in the provider's list"
2) In the forwarding rule, set the match pattern to the last 6 or 7 characters of the phone number, as occasionally the area code and/or country code may not get transmitted by the mobile or DID provider (CID Pattern = _.XXXXXX)
3) The Voxalot account with the Forwarding rule should be "Registered" on an ATA or soft phone, otherwise Voxalot does not have a user's IP address to forward to Betamax, and the call will likely not go through.
4) If you use the same Voipstunt account from another location on it's Windows client or any softphone, again the call will probably not go through. As far as I know, only one call at a time and one active registration are allowed with Betamax VSPs.
5) Call forwarding in the Voipstunt client is not Free. It is a charged feature. See the note under Tools\Options\Call-Settings\ in the Windows client.
The method described by Martin above falls under a "Call" not a "Forward" in Voipstunt and should work in the free use period also.
As such, after pointing the DID to SIP:xxxxxx@voxalot.com (or registering the DID provider in Voxalot), the rule might look like this :
Priority : 1
Inbound CID Pattern : _.654321 (Last x digits of number)
Day & Time: Set start and end as desired
Active: Yes
Forward Inbound Call to : Phonenumber (00xxxxxxxxxxx), Provider (Voipstunt)
_.
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