SIP doesn't work like POTS lines where you have one line per number. In your case, you have one SIP trunk, 3 concurrent channels, and 3 DIDs. You can have any number of DIDs and any number of channels over that one trunk. If your incoming URI for all 3 lines is * then the calls will all be presented to the first one, since * will match every number that is presented to the PBX and since you don't have a more explicitly defined URI it'll always use that. If you want each number to be it's own separate incoming and outgoing group ID then setup one URI per DID and use the individual DIDs, not *. Or what I normally do, leave * and define the incoming call routes for trunk group 19 with the individual DIDs and delete the other URIs.
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