1. In general, it's pretty much use
obitalk.com or configure it manually, but not both. Once you have a good starting point using
obitalk.com, disable Provisioning on the OBi and you can safely configure it manually from that point on.
2. The following LINE Port DigitMap should allow 11-, 10-, or 7-digit dialing as well as international calling:
(1xxxxxxxxxxS0|<1>[2-9]xxxxxxxxxS0|<1aaa>xxxxxxxS4|011xx.|xx.)
where aaa is your local area code.
I'm assuming the tk600 supports US calling as 1 + area code + number and international calling as 011 + country code + number. If this is not the case, please provide the exact dialing formats that are required.
3. Sorry, I can't help on this one.