Apologies if this is naive, as I don't know about headers, but if emoci's suggestion did not work, would it make any difference to define dialplan entries as pseudo speed-dials?
Aaprt from that, I just tried using the Voxalot web callback to connect 2 Betamax brands together using a third. The first PC software client rang, but the second failed; on the ensuing Voxalot page, the second username has a leading *2* and my voxalot account inserted before 007 then the VB username
So you might be able to make one call ...
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