Aastra Telecom SIP 480I - Manual (Page 137)

Operational Features
41-001129-00 Rev 09, Release 1.4.1 5-25
Operational Features
Operational Features
Aastra Web UI
1 Click on Basic Settings->Preferences->General.
2 Enable the "Suppress DTMF Playback" field by checking the check box.
(Disable this field by unchecking the box). Default is disabled.
3 Click to save your settings.
You must restart your IP phone for the changes to take affect.
4 Click on Operation->Reset.
5 In the "Restart Phone" field click to restart the IP phone and apply the changes.