I suspect that you can get the 2 Voxalot accounts on the same ATA to be able to communicate by creating a forwarding account (Eg. with Callcentric), set up to forward the call to the second channel.
From Channel A, call the forwarding account which forwards to Channel B.
To reduce the length of the number to call you can set up a speed dial in the Voxalot dial plan, or a Sipbroker alias.
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