User`s guide

• Call progress tone
• Ring back tone
• Busy tone
• Call alert (ringing) tone
• Error tone
• DTMF tones for all numeric keys
• Call Waiting Tone
8.3.3. Calling Features
• MUTE: When pressed, the MGCP phone turns off the microphone signal from
the handset but still plays voice from the other party.
• HOLD: When pressed, the MGCP phone disconnects both microphone and
speaker while connection is kept alive. No voice packets are transmitted from
the D-Link MGCP phone. Hold LED is on. User may press again to release the
call. This feature requires support from the remote phone for proper
functioning.
• REDIAL: When pressed, redials last dialed number.
• TRANSFER: Toggle the hook-switch quickly to flash (transfer) the call. The
MGCP phone plays dial tone. Then enter the party to transfer the call by the
general dialing method. The MGCP phone transfers the call and plays busy
tone. Flashing the hook twice before dialing the number will restore the call to
normal state (to call-active state).
• SPEAKERPHONE: One-touch dialing key. When pressed, speaker LED is on
and speaker itself is on while on-hook. If user off-hooks after dialing or
presses this button again the one-touch operation is terminated, LED and
speaker are both turned off. Note: This is not a true speakerphone, but is
designed to allow one-touch dialing. Although the other party can hear through
the speakerphone, voice quality is very poor.
• CALL WAITING: Call-waiting tone will be played whenever a new party calls
while a call is in progress. By pressing the hook-switch MGCP will switch to
the incoming call. Pressing again will switch between two parties.
8.3.4. Algorithms
Codecs: D-Link MGCP phones supports G.711 U/A law, G.723.1, and G.729AB. The
browser configuration allows selecting codecs and their priority.
Voice activity det ction, sil nce suppr ssion, and comfort noise generation: The VAD
can be disabled in the configuration irrespective of the codec being used.
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Adap ive Ji e Buffe : D-Link MGCP phones uses a robust adaptive jitter buffer
algorithm. It can be disabled and a fixed-size jitter buffer can be used instead through
configuration.
8.3.5. Other features
Remo e software upgrade: A predefined key sequence will download the MGCP phone
software and restart the phone. The MGCP phone should have been configured with the
correct TFTP server IP address.
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