Thanks emoci, now it's clear. I'm somewhat concerned on reliability though - planned to withdraw my home and cell numbers from "public" use, and give everyone my DID(s) that I can fully manage. But then reliability is crucial.
It looks jack9901's suggestion might work even better:
- Provider(s) registered with Voxalot
- Voxalot does filtering by time etc, and sends calls on different mysipswitch sub-URIs
- ATA registered with mysipswitch
- mysipswitch sub-URIs do all the job on ringing the ATA and all possible PSTN I ever need.
What do you think?
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