How to Configure Codec on a Grandstream Phone
How clear voices are understood over the Internet when using your Grandstream Session Initiation Protocol (SIP) phone depends on whether the correct Coder-Decoder was selected. Dropped lines and jumbled, scratchy voice distortion are some side effects of bad codec choices. This is due to the fact that the number of voice frames that can be transferred per Ethernet packet is limited. With the Grandstream phone, you will not miss any calls when you configure the codec. If a call comes in, the "Menu" mode will close so that you or someone else can answer the phone.
Instructions
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1
Place the phone in its cradle on the hook and then press "MENU" when the phone is idle and no calls are coming through.
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2
Press the up or down arrow to select menu item "7."
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3
Press "MENU" and then press the up or down arrows to view the list of available codecs, which include "G-711A 2," "G-722 2," "G-723 1," "G-726 2," "G-728 8," "G-729 2" and iLBC 1."
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Press "MENU" to select the codec that appears on the display.
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Restart the Grandstream phone to apply the new codec setting. If transfer quality is negatively affected, repeat these steps and select another codec from the list.
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Tips & Warnings
Prepare ahead and have your codec(s) selected prior to entering the "MENU" keypad mode, because it will close after 20 seconds of non-use or when a call is received.
