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Line Number
This parameter is not configurable; it is allocated by the system.
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Line Sub Type:
Select to match the particular line type provided by the line provider. E1 PRI trunks support ETSI, QSIG A or QSIG B.
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Telephone Number:
Used to remember the external telephone number of this line to assist with loop-back testing. For information only.
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Prefix: Default = Blank.
The prefix is used in the following ways:
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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.
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For outgoing calls, when the number presented to the line for dialling includes the prefix, the prefix is stripped.
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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.
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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.
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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.
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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 - depending upon the number of channels subscribed.
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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.
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Voice Channels
The number of channels available for voice use.
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Data Channels
The number of channels available for data use.
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CRC Checking: Default = On
Switches CRC on or off.
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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.
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The CO feature operates on this line type by modifying the way in which incoming calls are disconnected for IP Office 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.
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Clock Quality: Default = Network
Sets whether the IP Office takes it clock source for call synchronization and signalling from this line. One line connected to the IP Office should be set to Network. and wherever possible this should be a line connected to the central office exchange. Another line can be set to Fallback but all other lines should be set to Unsuitable.
The following fields are shown for a US T1 trunk card set to ETSI or QSIG operation. These cards have the same settings E1 PRI trunk cards set to ETSI or QSIG but only support 23 channels.
