Auerswald COMpact 4000 Operation Manual page 504

Functions
Preferred Exchange Line
Switching Preferred Exchange Line for Group On/Off
1. Open the page Groups > Properties > Exchange line settings.
2. In the list field at the top, select the group in question by its name or number.
3. In the Preferred exchange line list field, select one of the following options:
No: For outgoing external calls, any available fixed network connection is used.
Exchange line dependent: For outgoing external calls, the connections
released under Expert are used depending on the selected priority. This
makes the definition of a preferred exchange line (priority = 1) with overflow to
other connections (priority > 1) possible. Exchange lines with priority No
preferred exchange line are not used for outgoing calls.
Like subscriber: There are no global settings for the group but the individual
subscriber settings are active.
Note for the option Exchange line dependent:
If all released connections are busy, it is no longer possible to call.
The subscriber can only use a connection with the setting No preferred
exchange line by entering a character string (see chapter Short Reference
> Targeted Exchange Line Access).
The same priority may be allocated to different external connections in
parallel.
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COMpact 4000 - Firmware V6.6A - Installation, Operation and Configuration V03 03/2016