Line Number

This parameter is not configurable; it is allocated by the system.

Line Sub Type

Select to match the particular line type provided by the line provider. The options are:

• ETSI

• ETSI CHI

• QSIG A

• QSIG B

ETSI CHI is used to send the channel allocation ID (CHI) in the call setup signaling. This is a request to use a particular B-channel rather than use any B-channel allocated by the central office exchange.

QSIG trunks are not supported on IP500 V2 systems without IP500 Voice Networking licenses.

Card/Module

Indicates the card slot or expansion module being used for the trunk device providing the line.

For IP500 V2 control units: 1 to 4 match the slots on the front of the control unit from left to right.  Expansion modules are numbered from 5 upwards, for example trunks on the module in Expansion Port 1 are shown as 5.

Port

Indicates the port on the Card/Module above to which the configuration settings relate.

Network Type

Default = Public.

This option is available when System | Telephony | Telephony | Restrict Network Interconnect  is enabled. It allows you to configure trunks as either Public or Private.

• The IP Office will return number busy indication to any attempt to connect a call on a Private trunk to a Public trunk or the opposite.

• The call restriction includes transfers, forwarding and conference calls.

• Avaya does not recommended use of this feature on IP Office systems using any of the following features:  multi-site networks, VPNremote, application telecommuter mode.

Telephone Number

Used to remember the external telephone number of this line to assist with loop-back testing. For information only.

Channel Allocation

Default = 30|1.

For lines set to ETSI CHI, this option allows the system to select the default order in which channels should be used for outgoing calls. Typically this is set as the opposite of the default order in which the central office exchange uses channels for incoming calls.

For lines set to the Line Sub Type of ETSI CHI, the Incoming Group ID is set as part of the individual channel settings.

Incoming Group ID

Default = 0, Range 0 to 99999.

The Incoming Group ID to which a line belongs is used to match it to incoming call routes in the system configuration. The matching incoming call route is then used to route incoming calls. The same ID can be used for multiple lines.

Outgoing Group ID

Default = 1. Range 0 to 99999.

When a short code specifies a number to dial, the IP Office will seize an available line from those available with a matching Outgoing Group ID.

In a Server Edition/Select network, the Outgoing Group ID used for lines to a system must be unique within the network.

Reserved Group ID Numbers

• 0 - In a Server Edition/Select network, the ID 0 cannot be used.

• 90000 - 99999 - Reserved for system use (not enforced).

  • 96666 - Use for ACO lines.

  • 98888 - For IP Office deployed in an Enterprise Branch environment, reserved for the SM line.

  • 99001 - 99148 - In a Server Edition/Select network, reserved for the IP Office lines from the primary and secondary servers to each expansion system in the network.

  • 99998 - In a Server Edition/Select network, reserved for the IP Office lines to the secondary server.

  • 99999 - In a Server Edition/Select network, reserved for the IP Office lines to the primary server.

Prefix

Default = Blank.

The prefix is used in the following ways:

• For incoming calls The ISDN messaging tags indicates the call type (National, International or Unknown). If the call type is unknown, then the number in the Prefix field is added to the ICLID.

• For outgoing calls The prefix is not stripped, therefore any prefixes not suitable for external line presentation should be stripped using short codes.  

National Prefix

Default = 0

This indicates the digits to be prefixed to a incoming national call. When a number is presented from ISDN as a "national number" this prefix is added. For example 1923000000 is converted to 01923000000.

International Prefix

Default = 00

This indicates the digits to be prefixed to an incoming international call. When a number is presented from ISDN as an "international number" this prefix is added. For example 441923000000 is converted to 00441923000000.

TEI

Default = 0 The

Terminal Equipment Identifier. Used to identify each Control Unit connected to a particular ISDN line. For Point to Point lines this is typically (always) 0. It can also be 0 on a Point to Multi-Point line, however if multiple devices are sharing a Point to Multi-Point line it should be set to 127 which results in the exchange deciding on the TEI's to be used.

Number of Channels

Defines the number of operational channels that are available on this line. Up to 30 for E1 PRI, 23 for T1 PRI.

Outgoing Channels

This defines the number of channels available, on this line, for outgoing calls. This should normally be the same as Number of Channels field, but can be reduced to ensure incoming calls cannot be blocked by outgoing calls. Only available when the Line Sub Type is set to ETSI.

Voice Channels

The number of channels available for voice use. Only available when the Line Sub Type is set to ETSI.

Data Channels

The number of channels available for data use. Only available when the Line Sub Type is set to ETSI.

CRC Checking

Default = On

Switches CRC on or off.

Line Signalling

Default = CPE This option is not used for lines where the Line SubType is set to QSIG. Select either CPE (customer premises equipment) or CO (central office). The CO feature is intended to be used primarily as a testing aid. It allows PRI lines to be tested in a back-to-back configuration, using crossover cables.

The CO feature operates on this line type by modifying the way in which incoming calls are disconnected for system configuration in Brazil and Argentina. In these locales, the CO setting uses Forced-Release instead of Clear-Back to disconnect incoming calls. The Brazilian Double-Seizure mechanism, used to police Collect calls, is also disabled in CO mode.

Clock Quality

Default = Network

Refer to the IP Office Installation Manual for full details. This option sets whether the system should try to take its clock source for call synchronization and signalling from this line. Preference should always be given to using the clock source from a central office exchange if available by setting at least one exchange line to Network.

• If multiple lines are set as Network, the order in which those lines are used is described in the IP Office Installation Manual. If additional lines are available, Fallback can be used to specify a clock source to use should the Network source not be available.

• Lines from which the clock source should not be taken should be set as Unsuitable.

• If no clock source is available, the system uses its own internal 8KHz clock source.

• In scenarios where several systems are network via digital trunk lines, care must be taken to ensure that all the systems use the same clock source. The current source being used by a system is reported within the System Status Application.

Add 'Not-end-to-end ISDN' Information Element

Default = Never

Sets whether the optional 'Not end-to-end ISDN' information element should be added to outgoing calls on the line. The options are:

• Never

• Always

• POTS(only if the call was originated by an analog extension).

The default is Never except for the following locales:

• for Italy the default is POTS.

• for New Zealand the default is Always.

Progress Replacement

Default = None.

Progress messages are defined in the Q.931 ISDN connection control signaling protocol. Generally, if a progress message is sent, the caller does not get connected and so typically does not accrue call costs.

Not all ISDN lines support Q.931 Progress messages. Use this setting to configure alternative signaling to the ISDN line for internally generated Progress messages. The options are:

• Alerting: Map to Q.931 Alerting. The call is not connected. The caller does not hear the message and typically does not accrue call costs.

• Connect: Map to Q.931 Connect. The caller hears the message and typically will accrue call costs.

Supports Partial Rerouting

Default = Off.

Partial rerouting (PR) is an ISDN feature. It is supported on external (non-network and QSIG) ISDN exchange calls. When an external call is transferred to another external number, the transfer is performed by the ISDN exchange and the channels to the system are freed. Use of this service may need to be requested from the line provider and may incur a charge.

Force Number Plan to ISDN

Default = Off.

This option is only configurable when Support Partial Rerouting is also enabled. When selected, the plan/type parameter for Partial Rerouting is changed from Unknown/Unknown to ISDN/Unknown.

Send Redirecting Number

Default = Off.

This option can be used on ISDN trunks where the redirecting service is supported by the trunk provider. Where supported, on twinned calls the caller ID of the original call is passed through to the twinning destination. This option is only used for twinned calls.  

Support Call Tracing

Default = Off.

The system supports the triggering of malicious caller ID (MCID) tracing at the ISDN exchange. Use of this feature requires liaison with the ISDN service provider and the appropriate legal authorities to whom the call trace will be passed. The user will also need to be enabled for call tracing and be provider with either a short code or programmable button to activate MCID call trace. Refer to Malicious Call Tracing in the Telephone Features section for full details.

Active CCBS Support

Default = Off.

Call completion to a busy subscriber (CCBS). It allows automatic callback to be used on outgoing ISDN calls when the destination is busy. This feature can only be used on point-to-point trunks. Use of this service may need to be requested from the line provider and may incur a charge.

Passive CCBS

Default = Off.

Cost Per Charging Unit

Advice of charge (AOC) information can be output in SMDR. The information is provided in the form of charge units. This setting is used to enter the call cost per charging unit set by the line provider. The values are 1/10,000th of a currency unit. For example if the call cost per unit is £1.07, a value of 10700 should be set on the line. See Advice of Charge.

Admin

Default = In Service.  

This field allows a trunk to be taken out of service if required for maintenance or if the trunk is not connected.

Send original calling party for forwarded and twinning calls

Default = Off.

Use the original calling party ID when forwarding calls or routing twinned calls.

This setting applies to the following ISDN lines:

• PRI24 with subtypes: PRI, QSIGA, QSIGB, ETSI, ETSI CHI.

• PRI30 with subtypes: QSIGA, QSIGB, ETSI, ETSI CHI.

Originator number for forwarded and twinning calls

Default = blank.

The number used as the calling party ID when forwarding calls or routing twinned calls. This field is grayed out when the Send original calling party for forwarded and twinning calls setting is enabled.

This setting applies to the following ISDN lines:

• PRI24 with subtypes: PRI, QSIGA, QSIGB, ETSI, ETSI CHI.

• PRI30 with subtypes: QSIGA, QSIGB, ETSI, ETSI CHI.

CSU Operation

Check this field to enable the T1 line to respond to loop-back requests from the line.

Haul Length

Default = 0-115 feet

Sets the line length to a specific distance.

Channel Unit

Default = Foreign Exchange This field should be set to match the channel signaling equipment provided by the Central Office. The options are Foreign Exchange, Special Access or Normal.