As far as know, no Betamax products support incoming SIP calls from other providers. Inbound is only via the PSTN route or peers.
The only way I see it is to register the said VoIPCheap account on a VoXalot or MySIPSwitch account and register the 286 to that account. This way, your incoming calls to VoIPCheap would reach your ATA as well as through SIPBroker. Outbound could be through a dialplan. If you don't even need the VoIPCheap peer calls, you would not even need to register that account but use it as a pure outbound provider.
Kris
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