Hitachi TD61-2472 - Manual (Page 45)

1.11.1.1 Distinctive Ringtones
You can switch the ringtone/ mode/ LED for inside lines and outside lines.
1 To set the ringer for a call coming in on an outside line, either press the "1"
on the number pad or select "1. External 1", then press the
key.
To set the ringer for a call coming in on an inside line, either press the "3" on
the number pad or select "3. Internal 1", then press the
key.
There are four settings available, two each for inside and outside lines.
Example
Setting Ringer Mode LED
External 1 Bell 1 Bell Blue
External 2 Bell 5 Vibration Red
Internal 1 Bell 11 Bell + vibration No alert
Internal 2 Bell 13 Mute Blue
*
With some connection equipment, this is not possible. In this case, only "1.
External 1" is enabled.
1.11.1.2 Ringtones
Setting the inside line and outside line ringer tones.
1 To change the ringer tone, select "1. Ringer tone".
2 Use the keys to select the ringer tone, then press the key.
Hitachi Cable 41