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Figure 4-16. CO-Lines Linked to Phone Buttons
From a system point of view, the status of a CO-line is similar to the status of an
extension: It may be idle, connected, ringing, or on hold. It also might be holding a
parked call. Therefore, the mechanism that shows the status of a CO-line is similar to
the mechanism that shows the status of an extension. This implies that the name of the
CO-line must not clash with the name of an extension or any other account on the
system. (To be able to see the CO-line status, the user agent needs to subscribe to the
status of the CO-line. See the description of the phones on how to do this.)
13. Permissions to monitor this account: Enter the extensions that are permitted
to monitor this account.
14. Override codec preference: Use this setting to specify particular codec prefer-
ences for the trunk. By default, the system uses the codec preference of the sys-
tem, which has the advantage of allowing the system to negotiate codecs in such
a way that transcoding can be avoided. (When default mode is used, no codecs
will be displayed on the left side of the codec selection box.)
If it is necessary to enforce specific codecs on a trunk, choose a codec from the
list of available codecs and click the Add button. Repeat as needed. Be sure to
position the codec with the highest preference first. To delete a codec, click the
Remove button. To move a codec up or down in the preference list, use the Up
and Down buttons.
Phone
CO lines
Buttons
7
8
9
10
Chapter 4: Trunks
CO1
CO2
CO3
CO4
135
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