PBX Line

The PBX Line object defines one of the group of physical telephone lines or ISDN Primary Rate Interfaces that connect the PBX to the NE, or the Configured SIP Binding that connects the PBX to the NE, and specifies how it is used. It is a child of the PBX Lines object.

An ISDN Primary Rate Interface used as a PBX Line can support multiple concurrent telephone calls, so you may only need one PBX Line if the PBX uses ISDN. If you need to add more PBX Lines, each one must use a separate ISDN Primary Rate Interface.

A SIP PBX can only have one PBX Line configured, but this PBX Line can support multiple calls.

To configure and enable a PBX Line, you need to do the following:


Parameter

Access

Description
Configured SIP Binding Change Inactive This field appears only if the Call Agent signaling type field on the PBX object is set to SIP. Specifies the configured SIP binding that this PBX Line uses to connect to the NE. To specify a configured SIP binding, click on the ellipsis symbol at the end of the field to select from a list of configured SIP bindings for which the Usage field is set to Subscriber.
PBX Line usage Change Inactive Specifies which types of incoming calls are accepted on this line. This allows you to allocate one or more lines to the PBX for specific purposes, for example to ensure that a certain number of lines are always available for calls to the switchboard operator or for Direct Inward Dial. This field appears only if the Call Agent signaling type field on the PBX object is set to Analog line/T1 CAS. Values:
  • Listed Direct Number only (default)
    The line can be used only for calls to the switchboard operator.
  • Direct Inward Dial only
    The line can be used only for calls using Direct Inward Dial.
  • Direct Inward System Access only
    The line can be used only for calls using Direct Inward System Access.
  • Listed Direct Number or Direct Inward Dial
    The line can be used either for calls to the switchboard operator or for calls using Direct Inward Dial.
If you specify either of the Direct Inward Dial values, the Signal function code field must be set to a value that supports E and M terminating or LRB terminating (not loop start, ground start, or any of the originating only values).
Access Device Create This field appears only if the Number status field on the PBX object is set to Normal, Ported to, or Non-geographic and the Call Agent signaling type field on the PBX object is set to Analog line/T1 CAS. The Access Device that this line uses to connect to the NE. Click on the ellipsis symbol at the end of the field to choose from access devices on Trunk / Access Gateways or access devices on Subscriber Gateways. Then select from the displayed list of gateways of the specified type, and then select from the displayed list of Access Devices on the specified gateway.
Access Line number Create This field appears only if the Number status field on the PBX object is set to Normal, Ported to, or Non-geographic and the Call Agent signaling type field on the PBX object is set to Analog line/T1 CAS. The Access Line number on the specified Access Device that this line uses. Either type in the number (which must not match the access line number used by any other subscriber on this access device), or click on the ellipsis symbol at the end of the field to select from the list of numbers not currently in use. The highest line number that you can specify depends on the access device type: for an IAD it is the number of voice ports configured, for an IDT Port it is 2048, and for other devices it is a configured parameter on the access device. If you click on the ellipsis symbol, the dialog box that appears offers 'manual selection' or 'automatic selection'.
  • If you select 'automatic selection', the EMS will assign the subscriber the next free access line number for this device.
  • If you select 'manual selection', the following dialog box presents sub-ranges of access line numbers. Select the sub-range from which the number should be taken and click on Next. In the next dialog box, select a number and click on OK to accept this number. (If no number is shown, this indicates that there are no free numbers in the range; click on Back and select a different number range.)
ISDN Interface Change Inactive The ISDN Primary Rate Interface that this subscriber uses to connect to the NE. This field appears, and must be supplied, only if the Call Agent signaling type field on the PBX object is set to ISDN PRI. Select from the displayed list of ISDN Primary Rate Interfaces that have Usage set to Access (trunk PRIs cannot be used for subscriber access). Each PBX Line corresponds to its own ISDN PRI (which can support multiple concurrent telephone calls); you cannot configure two PBX Lines using the same ISDN PRI.
ISDN default bearer capabilities Change Inactive Bearer capabilities (types of ISDN calls) for which this subscriber is the default subscriber. This field appears, and must be supplied, only if the Call Agent signaling type field on the PBX object is set to ISDN PRI. For each ISDN Primary Rate Interface, only one subscriber can be the default subscriber for each bearer capability. If an incoming ISDN call has no addressing information to identify the subscriber, it is routed to the default subscriber for the appropriate capability. Normally, you will configure one subscriber who is the default subscriber for all capabilities, so the default is all values selected. If you are configuring two or more subscribers on the same ISDN Primary Rate Interface, you will need to change this setting so that only one subscriber is the default for each capability. Select one or more of the following values.
  • Speech or 3.1kHz audio
  • 64kbps data
  • 64kbps restricted
  • 56kbps data
Signal function code Change Inactive This field appears only if the Call Agent signaling type field on the PBX object is set to Analog line/T1 CAS. The subscriber's signal function code which is used for CAS signaling. Values:
  • Loop start
  • Ground start
  • E and M wink start (default)
  • E and M wink start (Originating), delay start (Terminating)
  • E and M wink start (Originating only)
  • E and M immediate start (Originating only) (not valid for Direct T1 CAS or GR-303)
  • E and M wink start (Terminating only)
  • E and M delay start (Terminating only)
  • LRB wink start
    The abbreviation LRB indicates Loop Reverse Battery.
  • LRB wink start (Originating only)
  • LRB wink start (Terminating only)
  • Reversed LRB wink start (Originating only)
  • LRB delay start (Terminating only)
  • LRB wink start (Originating), delay start (Terminating)
If the PBX Line usage field is set to either of the Direct Inward Dial values, this field must be set to a value that supports E and M terminating or LRB terminating (not loop start, ground start, or any of the originating only values). If the PBX Line uses an Access Device on a Subscriber Gateway that is controlled using MGCP (as specified in its Remote Media Gateway Model), the values Loop start and Ground start are equivalent. All of the E & M and LRB values are also equivalent, except that the Originating only and Terminating only values mean that the line can be used only for outgoing calls or only for incoming calls.
Line usage Change Inactive Specifies whether the subscriber intends to use this line for voice and/or fax, or exclusively for fax. This controls the use of compression on the line. Values:
  • Voice and fax (default)
    Use this setting if the line can be used for voice calls. The line normally uses 32kbps ADPCM compression (G.726), which is appropriate for voice lines, but switches automatically to uncompressed 64kbps PCM (G.711) if it detects a fax or modem tone.
  • Fax only
    Use this setting only if the line is used exclusively for fax or modem calls. The line uses uncompressed 64kbps PCM (G.711), which may result in echo if the line is used for voice calls.
Nailed-up connection Change Inactive This field appears only if the Call Agent signaling type field on the PBX object is set to Analog line/T1 CAS and the configured Access Device uses a GR-303 IDT. An IDT may be set up so that there are more subscribers than available DS0s within the IDT's Interface Group, so it is possible that a subscriber will be unable to make a call if other subscribers are already using all of the DS0s. Nailing up the connection for a specific subscriber gives priority by ensuring that a DS0 is always reserved for this subscriber's use (except when the configuration prevents the subscriber from making or receiving calls, or when there is a shortage of DS0s because of a failure). In order for this to work, the number of subscribers with nailed-up connections must be smaller than the number of DS0s available in the Interface Group. Values:
  • True
    A DS0 will be reserved for this subscriber if there is one available.
  • False (default)
    The subscriber may sometimes be unable to make a call during busy periods when other subscribers are using all of the available DS0s.
GR-303 dial type Change Inactive This field appears only if Call Agent signaling type is set to Analog line/T1 CAS, Signal function code is set to Loop start or Ground start, and the configured Access Device uses a GR-303 IDT. Choose whether the subscriber line supports DTMF dialing in addition to pulse dialing. Values:
  • DTMF or Pulse Dial (default)
  • Pulse Dial only
FSK format Change Inactive The type of FSK tones used to pass Caller ID and Visual Message Waiting Indicator messages to this line. This field appears only if the Call Agent signaling type field on the PBX object is set to Analog line/T1 CAS, and does not appear if the subscriber uses an access device on a Subscriber Gateway. Values:
  • UK
    Standard UK format
  • Bellcore
    Standard North American format
Line side answer supervision supported Change Inactive Specifies whether Line Side Answer Supervision is supported for this line. This field appears only if the Call Agent signaling type field on the PBX object is set to Analog line/T1 CAS. Values:
  • True (default)
  • False
PBX plays ringback Change Inactive Specifies whether the PBX provides audible ringing tone to the subscriber. Values:
  • True
  • False
The default is False if the grandparent PBX object has a Call Agent signaling type of Analog line/T1 CAS, and this object's Signal function code is set to Loop start or Ground start; otherwise, the default is true. This parameter is ignored if the PBX Lines use ISDN signaling over an ISDN Primary Rate Interface that is configured to support ringback. The switch provides ringback only if neither the PBX nor the ISDN PRI supports it.
PBX plays dialtone Change Inactive This field is only visible if the grandparent PBX object has a Call Agent signaling type of Analog line/T1 CAS. Specifies whether or not the PBX provides a dialtone to the susbcriber. Values:
  • True
  • False
The default is False if Signal function code is set to Loop start or Ground start; otherwise, the default is true.
Alarm state Read only Specifies whether any alarms are currently raised for this subscriber. Values:
  • Clear
    No alarms are currently raised.
  • Attention Required
    Attention Required - the object is not operating normally, and needs operator intervention.
  • Attend To Dependent
    Attention Required elsewhere - another object on which this object depends is not operating normally.
Alarm log correlator Read only Identifier of the log message that was generated when this subscriber last entered Attention Required or Attend To Dependent alarm state. This field is reset when the Attention Required alarm events and the Attend To Dependent alarm events are reset to zero.
Additional alarm log correlator Read only If available, the identifier of the log message for the original event that caused the last Attention Required or Attend To Dependent alarm state for this object. This field is reset when the Attention Required alarm events and the Attend To Dependent alarm events are reset to zero.
Attention Required alarm events Read only / Reset Number of times (since the alarm count was reset) that this object's alarm state has gone to Attention Required.
Attend To Dependent alarm events Read only / Reset Number of times (since the alarm count was reset) that this object's alarm state has gone to Attend To Dependent.
Alarm state changed timestamp Read only The time at which the Alarm state last changed.
Diagnostics - logging - log level Change Specifies the level of logs recorded for this object. Logs with a priority equal to or greater than the priority specified are recorded. Set to Default level to use the system-wide default level. Values:
  • Level 10 (diagnostics)
  • Level 20 (verbose statistics)
  • Level 30 (verbose operational)
  • Level 40 (statistics)
  • Level 50 (audit)
  • Level 60 (operational)
  • Level 70 (unexpected)
  • Level 80 (error)
  • Level 90 (fatal)
  • Default level (default)
Diagnostics - API trace - enabled Change Specifies whether API tracing is enabled for this object. Values:
  • True
  • False (default)
Diagnostics - API trace - trace tag Change An optional diagnostics tag inserted into API tracing and PD logging for this object. This tag may include any ASCII characters.
Diagnostics - API trace - trace remote number Change The remote directory number that should be API traced. Outgoing calls made to this number or incoming calls received from this number should be API traced. If a directory number is not specified, all calls made by and received by this subscriber will be API traced.
Requested status Read only Specifies whether an administrator has attempted to enable the PBX Line. Values:
  • Enabled
    The object has been enabled.
  • Disabled
    The object has not been enabled or has been disabled.
Actual status Read only Specifies the current status of the PBX Line. Values:
  • Enabled
    The object has been enabled.
  • Disabled
    The object has not been enabled or has been disabled.