Draytek VIGORBX 2000 SERIES User Manual page 299

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FXO (Foreign exchange office) is a port that used to connect to PSTN network. This page is
used to configure settings related to FXP port.
Available settings are explained as follows:
Item
Session Timer
T.38 Fax Function
Prefer Codec
Packet Size
VigorBX 2000 Series User's Guide
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f o r F X O
f o r F X O
Description
Check the box to enable the function. In the limited time
that you set in this field, if there is no response, the
connecting call will be closed automatically.
Check the box to enable T.38 fax function.
Error Correction Mode – Choose a mode for error correction.
Select one of five codecs as the default for your VoIP calls.
The codec used for each call will be negotiated with the peer
party before each session, and so may not be your default
choice. The default codec is G.729A/B; it occupies little
bandwidth while maintaining good voice quality.
If your upstream speed is only 64Kbps, do not use G.711
codec. It is better for you to have at least 256Kbps upstream
if you would like to use G.711.
Single Codec – If the box is checked, only the selected Codec
will be applied.
The amount of data contained in a single packet. The default
value is 20 ms, which means the data packet will contain 20
ms voice information.
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