If you create Voxalot dialplans that give you a unique prefix for each provider, then you can incorporate the prefix into the dialled number.
So, for instance, using the following dialplans, dialling 1*<destinationnumber> will route the call through Sipgate and 2*<destinationnumber> will route it via Sipgate.
_1*. ${EXTEN:2} Sipgate
_2*. ${EXTEN:2} Voipcheap
The only thing that this doesn't do is to give you an intermediate dial tone, but would you really need it?
ataboy
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