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Documentation & Setup Guides
UnityTalk Telephone Adapter (Grandstream HT502 – Dual FXS Port)   CLICK HERE TO DOWNLOAD

UnityTalk User Manual
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How to use the Enhanced Features:

Caller ID - you will receive the callers name and number when available
To Block Caller ID (per call), Dial "*67" + number
To Unblock Caller ID (per call), Dial "*82" +  number
To Block Caller ID for all subsequent calls, Dial "*30" + number
To Unblock Caller ID for all subsequent calls, Dial "*31" + number

Call Forwarding All
To use Call Forwarding All , Dial "*72" and then the forwarding number followed by "#". dial tone and hang up. (dial tone indicates successful forward).
To cancel Call Forwarding All ,Dial "*73", wait for dial tone, and then hang up.

Call Forwarding Busy
To use Call Forwarding Busy, Dial "*90" and then the forwarding number followed by "#". Wait for dial tone then hang up.
To use Cancel Call Forwarding Busy, Dial "*91", wait for dial tone, and then hang up.

Call Forwarding Delayed
To use Call Forwarding Delayed, Dial "*92" and then the forwarding number followed by "#". Wait for dial tone then hang up.
To use Cancel Call Forwarding Delayed, Dial "*93", wait for dial tone, and then hang up.

Call Return
To use Call Return, Dial *69 and the phone will dial the last incoming phone number received.

Call Waiting per call
To disable Call Waiting (per call), Dial "*70" + " number". No dial tone is played in the middle.
To enable Call Waiting (per call). Dial "*71" + " number". No dial tone is played in the middle.

Call Waiting All
To enable Call Waiting for all subsequent calls, Dial "*51"
To enable call waiting for all subsequent calls, Dial "*50"

Do Not Disturb
To enable Do not Disturb, Dial "*78" .When enabled all incoming calls are rejected.
To disable Do not Disturb, Dial "*79". When disabled, incoming calls are accepted.

Redial
To use redial last number press the # sign.


Three-Way calling
While connected to an existing call, press the flash button on the phone.  You will hear a new dial-tone.  Dial the number of the person you would like to join the call.  After that person answers, press the flash button on the phone again.  You will hear a quick stutter tone and then all three parties will be connected.