Sony SPP-A985 - Manual (Page 66)

66 US Caller ID Features
To change the number of digits of the phone
number
If the number of digits of the phone number in the Caller ID list is
different from the actual phone number, you need to adjust the
number of digits of the phone number to call back or store into the
Phone Directory.
1
While the phone number from the Caller ID list is displayed,
press (#) repeatedly until the phone number with the
correct number of digits appears on the display.
Each time you press (#), the number of digits changes as
follows:
When the home area code and the local area code do
not match
When the home area code matches
Using the Caller ID list (continued)
SMITH JOHN
1-201-123-4567
SMITH JOHN
201-123-4567
SMITH JOHN
123-4567
SMITH JOHN
1-123-4567
SMITH JOHN
123-4567
SMITH JOHN
1-201-123-4567
SMITH JOHN
1-123-4567
SMITH JOHN
201-123-4567