see attached screenshots to use tektalk with OBI 100
After you get tektalk to be "connected" using Obitalk settings for generic service provider, reset the OBI.
Try an outgoing call. If you get the "do not dial 1 error" but it says "registered" go into obitalk expert configuration, service providers, and uncheck both boxes, then delete the <1> I used ISTP- a because I was using SP1 for tektalk