Panasonic KX-FT21RS - Manual (Page 50)

2.3.4.2.2. Remote programming
If, after the call is connected, the customer describes the situation and it is determined that the problem can be corrected by making
parameter changes, this function makes it possible to change parameters such as the user code and service code from another
fax (using DTMF tones). Therefore, travel to the customer´s location is not required. However, it is not possible to change all the
parameters remotely (2. Program mode table). The function used to accomplish this is remote programming.
First, in order to check the current status of the service code parameter, out put the setup list (code: 991) and service list (code:
999) from the customer´s fax machine. Based on this, the parameters for the desired codes can be changed. The procedure for
changing and listing parameters is described on 1. Entering the remote programming mode and Changing service codes.
Also, before exiting the remote programming mode, it is advisable to obtain a new list to confirm that only the desired parameters
were changed.
Hint:
Since the connected telephone is in use during the remote programming mode, it may be helpful to ask the customer to switch
to the speakerphone (except for a digital speakerphone). This frees the customer from the need to remain right next to the fax
while you are making parameter settings. When finished, inform the customer. Also note that in very noisy locations where the
DTMF tones are not audible, the remote programming function will not work.
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KX-FT21RS