How to setup dial plan for ISN/Freenum support

[patrickdepinguin]

Hi,

I would like to be able to call ISN (Itad Subscriber Numbers) through voxalot.
ISN numbers are of the form 1234*567, analog to user@domain.
567 is a number assigned to an organization, and 1234 is the user you are dialing.

This page: ISN Cookbook describes how to setup outbound calling to ISN numbers.
However, I'm not able to set it up through voxalot.

Basically, three methods are described:
* Native ISN Lookup: I guess this is not possible through voxalot
* Using the Freenum SIP Redirector: Here you need to send an invite message to the number you call @public.freenum.org, e.g. 1234*567@public.freenum.org . This server will send a redirection message back to the real SIP uri.
* Resolve Freenum/ISN Through Private ENUM: This is an option I don't really understand, and don't know if it's possible on voxalot.

I tried using option 2, by setting up a Voice Service Provider for freenum in Voxalot. However, since there are no account settings for freenum.org, I put 'test' as username and password.
I added a dialplan setting with pattern
_X.*X.
to be replaced by
${EXTEN}
using the freenum server.

However, this does not seem to work, and I'm getting a "602 declined" SIP message back.

When I use a Speeddial to directly call to 1234*567@public.freenum.org, it does work, and I do get the redirection message.

Can anyone help me?
Thanks, Thomas