Line Settings

The line settings shown in the IP Office configuration will change according to the types of trunk cards installed in the IP Office control unit or added using external expansion modules. Some models of IP Office Small Office Edition control units include up to 4 integral analog trunk ports.

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WARNING: Changing Trunk Cards
Changing the trunk card installed in an IP Office control unit will result in line settings for both the previous trunk card and the currently installed trunk card. In order to change the trunk card type in a particular card slot, the configuration must be defaulted. This does not apply if replacing an existing card with one of a higher capacity or fitting a trunk card into a previously unused slot.

General Line Operation
The following are general principles for line operation with an IP Office system. Some particular line types may operate differently.

•	Routing Calls to/from Lines - Line Groups Each trunk channel belongs to an Incoming Line Group and an Outgoing Line Group. These are used as follows:

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Incoming Call Routes - Routing Incoming Calls
Within the IP Office configuration, Incoming Call Routes are used to determine where calls should be presented. The route used is determined by matching information received with the call such as incoming number, ICLID, call type and the Incoming Line Group of the line on which the call arrived.

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Short Codes - Routing Outgoing Calls
Short codes are used in several areas of the IP Office configuration to match digits dialed. Short codes that result in a number to be dialed includes a Line Group setting. This can specify a matching Outgoing Line Group from which a line should be seized if available or for IP Office 4.0 and higher an ARS form.

•	ARS (Alternate Route Selection) Calls can be routed to ARS forms. These forms for scenarios where different lines are used at different times or where no line in the outgoing line group is available.

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Clock Quality
Calls between systems using digital trunks (for example E1, E1R2, T1 PRI and BRI) require an common clock signal. The IP Office will try to obtain this clock signal from an exchange through one of its digital trunks. This is done by setting the Clock Quality setting of that Line to Network. If there are multiple trunks to public exchanges, another trunk can be set as Fallback should the primary clock signal fail. Other trunks should be set as Unsuitable.

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Removing Unused Trunks
In cases where a trunk is not connected, it is important to ensure that the trunk is set as being Out of Service within the configuration. Failure to do this may cause the IP Office to attempt to present outgoing calls to that trunk. Similarly, where the number of channels subscribed is less than those supportable by the trunk type, the unsubscribed channels should be disabled. On E1 and BRI trunks this can be done by setting the Number of Channels correctly. On all trunk types it can also be done by setting the Direction of the unsubscribed channels to Incoming.