Uniden XDECT 8155 Series Owner's Manual page 34

Chain Dialing
If you often have to enter a series of digits or a code number during a
call, you can save that code number to a phonebook entry and use the
phonebook to send the code number.
1) Make your call normally.
2) When you hear the prompt that tells you to enter the number, open the
phonebook and find the entry that contains your code number.
3) Press MENU/SELECT twice to send the code. If you change your
mind, just close the phonebook.
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