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SPEAKER: One-touch dialing key. When pressed, speaker LED is on and
speaker itself is on while on-hook. If the user off-hooks after dialing or presses
the button again, one-touch operation is terminated, LED and speakers turn
off.
9.5.4. Algorithms
Codecs:
D-Link SIP phones supports G.711 U/A law, G.723.1, and G.729AB. The
browser configuration allows selecting the codec and their priority.
Voice activity det ction, sil nce suppr ssion, and comfort noise generation.
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can be disabled in the configuration irrespective of the codec being used.
Adjustable Jitter Buffer:
algorithm. It can be disabled and a fixed size jitter buffer can be used instead through
configuration.
9.5.5. Other features
Remo e software upgrade:
t
software and restart the phone. The SIP phone should have been configured with right
TFTP server IP address.
Phone book:
This feature allows the phone to be used without a SIP server. A set of 10
numbers can be programmed to the phone and the phone will directly contact these
numbers without the help of SIP server.
Remote diagnosis:
The SIP phone will send status and other messages to the log server
configured in the SIP phone. The remote log server should run the server application
from D-Link to receive and display these messages. This feature can be disabled
through the browser.
Restore facto y defaults:
r
the configurable parameters to default values upon next restart.
Production testing:
If you enter the specific key sequence, the D-Link SIP phone will
execute a production test upon next restart. The production test is described later in
this section.
9.6.
SIP Troubleshooting
9.6.1. Error Conditions
The D-Link SIP phone detects the following error conditions and plays an error tone.
Error tone on network connection failure
It will return to normal state upon network connection. The link LED also gives this
information.
Error tone if there is no DHCP server
The phone will recover on detecting a DHCP server.
Error tone if the SIP proxy is down on power up
The phone will recover on detecting a SIP server.
Error tone if the called party is not registered.
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D-Link SIP phones uses a robust adaptive jitter buffer
A predefined key sequence will download the SIP phone
If you enter the specified key sequence, the SIP phone restores
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The VAD
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Table of Contents
Troubleshooting
