AASTRA 4420 IP Basic (SIP) for MX-ONE User Guide - Manual (Page 60)

Web Server
Dialog 4420 IP Basic 60
Settings - Ring signal tone character
Settings Click.
The sub-menus are shown.
Ring Character Click.
The current tone character is displayed.
( 0 — 9 ) Enter a new character.
Click to save.
The phone rings with the chosen character.
Log off Click to exit,
or
click any menu to continue.
Save