From other posts - Dial your own GV number - hit 2, enter the destination number, followed by # and you should get a good connection.
WORK AROUND (as picked up from a prior comment):
1. call my GV number
2. upon the call being answered by machine: press the number two < 2 >
3. key-in the number to be called
4. insert the number/pound key < # >
5. call is then connected with audio on both ends