I tested a similar configuration and also found that I cannot reach the Sipsorcery registered device from the Voxalot registered phone using a speed dial set up.
If I call from the Voxalot phone using the Sipbroker code (*9524xxxxxxxxx), then the call goes through. This only works if the Sipsorcery account name is numeric only.
The other way that might work for you is to set up the speed dial code (Eg 1234) as an entry in the dial plan, with a replacement as the Sipsorcery ID, and Sipsorcery as the outgoing provider (setup in your VoIP Providers listing as an unregistered entry).
I have used this approach for Betamax providers, but have not tried it yet for Sipsorcery.
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