The OBi by itself will not allow pauses.
There is a way using the OBi with a free account at
Tropo.com to dial with pauses.
See:
http://www.obitalk.com/forum/index.php?topic=5310.0To call with a speed dial:
sp2(9991234567@sip.tropo.com;ui=8009897676*1777)
9991234567 is your Tropo app number.
If the pause is not long enough add 1 or more asterisks.
I did not spend a lot of time developing this app and it has no error checking.
Edit:
I corrected an error in my speed dial example.
The called number must be 10 digits, not 11.