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When I go to answer calls I can only do so through the Speakerphone keyboard.

This occurs because the Operation with Headset function is activated.

To cancel it execute:

1-    Press the key Enter, navigate to option Operation with Headset and key Enter.

2-  There will appear the message Cancel already Programmed? and key Enter. 

This occurs because the Operation with Headset function is activated. 

To cancel it execute: 

1-    Press the key Enter, navigate to option Operation with Headset and key Enter. 

2-  There will appear the message Cancel already Programmed? and key Enter.