Yealink SIP-T48G - Manual (Page 41)

Customizing Your Phone
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You can set the "#" or "*" to perform as a send key while dialing.
To configure key as send via phone user interface:
1. Tap ->Call Features->General.
2. Tap the gray box of the Key as Send field.
3. Tap # or * from the pull-down list, or tap Disabled to disable this feature.
4. Tap the Save soft key to accept the change or to cancel.
Key as send is configurable via web user interface at the path Features->General
Information.
You can press the volume key to adjust the ringer volume when the phone is idle. You
can also press the volume key to adjust the receiver volume of currently engaged audio
devices (handset, speakerphone or headset) when the phone is in use.