RCA 29993 - Manual (Page 29)

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NOTE: The unit answers on the 10th ring when it is
turned off or the memory is full. To access the
answerer, enter the 3-digit security code after the
beep. If memory is full, play messages and erase
some of them to restore memory.
NOTE: After the unit plays the remote menu, it
waits 20 seconds for a command, then disconnects.
To access your answerer:
1. Call your telephone number.
2. After you hear the beep that follows the
greeting, enter your 3-digit security code.
The unit confirms your code with a beep.
To bypass the greeting, you can enter your
3-digit security code any time while the
greeting is playing.
The unit waits for a remote command for 20
seconds after the correct security code has
been entered. Menu selections can be made
while the menu is playing.