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Chapter 6: Using the Web-based Utility
The Voice Tab
IP Telephony System
Enable IP Dialing. To use IP dialing, select yes. Otherwise, select no. The default is no.
Emergency Number. This is a comma-separated list of emergency number patterns. If the outbound call
matches one of the patterns, then the System will disable hook flash event handling. Hook flash event handling
will be restored to normal when the phone is on-hook again. If you leave this field blank, then the System will
have no emergency number.
Mailbox ID. Enter the ID number of the mailbox for this line.
Audio Configuration
Preferred Codec. Select a preferred codec for all calls. (The actual codec used in a call still depends on the
outcome of the codec negotiation protocol.) Select one of the following: G711u, G711a, G726-16, G726-24,
G726-32, G726-40, G729a, or G723. The default is G711u.
Silence Supp Enable. To enable silence suppression so that silent audio frames are not transmitted, select yes.
Otherwise, select no. The default is no.
Use Pref Codec Only. To only use the preferred codec for all calls, select yes. (The call will fail if the far end does
not support this codec.) Otherwise, select no. The default is no.
Silence Threshold. Select the appropriate setting for the threshold: high, medium, or low. The default is
medium.
G729a Enable. To enable the use of the G729a codec at 8kbps, select yes. Otherwise, select no. The default
is yes.
Echo Canc Enable. To enable the use of the echo canceller, select yes. Otherwise, select no. The default is yes.
G723 Enable. To enable the use of the G723a codec at 6.3kbps, select yes. Otherwise, select no. The default
is yes.
Echo Canc Adapt Enable. To enable the echo canceller to adapt, select yes. Otherwise, select no. The default
is yes.
G726-16 Enable. To enable the use of the G726 codec at 16kbps, select yes. Otherwise, select no. The default
is yes.
Echo Supp Enable. To enable the use of the echo suppressor, select yes. Otherwise, select no. The default
is yes
.
Figure 6-42: Voice - FXS 1 Screen - Audio Configuration
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