Keri,
Sounds like there may possibly be leading whitespace? Try hitting backspace and making sure that there's no leading space present.
If that doesn't yield any results, you can add the Dial String into the SQL manually if you still can't get SAWeb to accept input:
Open SQL Enterprise Manager> Databases > Unitydb > Tables
Click on LocationTransfer table
Click on Action > Open Table > Return all rows
Manually enter the Dial String
Hope that helps,
Brad