i am not sure if voxalot has a simultanous call limit; but the ultimate limit has to do with a lot more. your outbound provider may have a limit; if it is a discount one(i.s. any free minutes included) this is just about a guarentee. also the DID nearly always has a limit of one or two calls incoming unless you purchase 'inbound trunks' for the number of calls you need. you can also find DID with unlimited channels that charge a per minute fee on every call.
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