Channel Button; Temporary Tone - GE 27906 Guia Del Usuario

Volume
When the phone is ON, press the CID/vol (5 or 6) on the
handset to adjust the volume of the handset's earpiece.
There are four settings. Press the CID/vol 5 to increase
the volume and CID/vol 6 arrow to decrease the volume.
You will see the volume setting on the handset display.
VOL  is the maximum and VOL 1 is the minimum.

Channel Button

While talking on the phone, you might need to manually
change the channel in order to reduce static caused
by appliances, such as baby monitors, garage door
openers, microwave ovens, or other cordless phones.
Press and release the delete/channel button to move to
the next clear channel.

Temporary Tone

This feature is useful only if you have pulse (rotary)
service. Temporary Tone Dialing enables pulse (rotary)
service phone users to access touchtone services
offered by banks, credit card companies, etc.
For example, when you call your bank you may need to
enter your bank account number. Temporarily switching
to touchtone mode allows you to send your number.