Hi azrobert,
Thanks for the suggestions! I hadn't seen the flash hook setting when looking through the OBI110 settings. That resolved the call waiting problem. Adding *72| and *73| (to disable call forwarding) to the digit map and {*72:li},{*73:li}, to the Outbound Call Route got the call forwarding working. Adding *97|*98 to the ITSP digit map did not work (at least in and of itself) but it occurred to me that this was related to the *72 problem, except in this case, I didn't want the outbound *97 to go to the POTS line, but instead back to the PBX on sp1. I added *97| to the list in the DigitMap of the PHONE port and added {*97:sp1}, to the start of the Outbound call route, and this seems to work.
Thanks again for your help!
Garry