Featurecode for mute option

recently i bought a ipphone ,in which there is no mute button.

is it possible to mute the phone by using any featurecode key.

please develop a featurecode key for mute option

An in-call featurecode for mute would need to be supported in the underlying asterisk engine. Unfortunately no such support exists. If and when asterisk adds builtin support for mute into its main/features.c source file then freepbx can be modified to offer a feature code for it