> 1- will the sipbroker dial plan work or need to be modified
Depends on your needs. The SIP Broker dial plan allows for anonymous ENUM / SIP-Code dialling. With VoXaLot you either have your ATA registered with VoXaLot or set-up VoXaLot as a gateway. See:
http://www.voxalot.com/action/static?itemOID=8
> 2- is there a way to add my existing plan to the sipbroker plan to avoid
> pressing # at the end of every dial
The # at the end of every dial from my experience is needed by the pap2 or spa2000
> 3- can a client of voxalot receive calls from the listed sipbroker PSTN
> access numbers? if yes what does the caller has to dial to reach my voxalot > number
*010 <voxalot number>