If I understand correctly, you want phone 1 and phone 2 to ring on an incoming call to sp1. You also want to ring another OBi, OBi500xxxxxx, and you also want to ring 514xxxxxxx. Is this correct?
If the above is correct I believe you should have for the inbound routing:
{ph1,ph2,pp1(ob500123456),sp3(15141234567)}