ISDN Interface Profile

The ISDN Interface Profile object is a child of the ISDN Interface Profiles object. It allows you to configure standard parameter settings that are used by one or more ISDN Primary Rate Interfaces.

Default ISDN Interface Profiles for user side and network side operation (for each of the supported ISDN variants) are supplied with the MetaSwitch NE. The default profiles should be suitable for most applications.


You cannot delete or disable an ISDN Interface Profile if one or more ISDN Primary Rate Interfaces refer to it.


Parameter

Access

Description
Description Change Inactive An optional text description of this ISDN Interface Profile. Specify a string of up to 64 characters, which must not match the description of any other ISDN Interface Profile.
Usage Create Indicates whether ISDN PRIs that use this profile operate using the user side or network side version of ISDN protocols. Values:
  • User side
  • Network side (default)
PRIs used for access from a PBX or RAS Server must always use a network side profile. For PRIs used for trunking to remote exchanges, the protocol version must be selected in conjunction with the remote exchange so that one end operates as user side and the other end as network side.
Protocol variant Create The variant of the control protocol used on ISDN Primary Rate Interfaces. Select the variant that most closely matches the remote equipment that you will be communicating with, or the variant used by that equipment. Values:
  • Telcordia National ISDN 2
    Telcordia NI-2 ISDN
  • DMS-100
    Nortel DMS-100 switch
  • DMS-250
    Nortel DMS-250 switch
  • 5ESS National
    Lucent 5ESS switch
  • 5ESS Custom
    Lucent 5ESS switch custom ISDN (also compatible with the 4ESS switch). Note that this variant does not support NFAS or D-channel backup.
T301 timer duration Change Inactive Duration in minutes of the T301 timer. This timer is used to clear calls that are not connected by the ISDN subscriber within the timeout afer an ALERT message was received. The range and default for this timer depend on the Protocol variant field, as follows.
  • Telcordia National ISDN 2: Range 3 - 7 minutes, default 5 minutes.
  • DMS-100 or DMS-250: Range unlimited, default 3 minutes.
  • 5ESS National or 5ESS Custom: Range unlimited, default 5 minutes.
T303 timer duration Change Inactive Duration in milliseconds of the T303 timer. This timer is started when a SETUP is sent on the ISDN interface, and is used to retry the SETUP or clear the call if no response is received. The range and default for this timer depend on the Protocol variant field, as follows.
  • Telcordia National ISDN 2: Range 1000 - 4000 (1 - 4 seconds), default 2500 (2.5 seconds).
  • All other variants: Range unlimited, default 4000 (4 seconds).
T305 timer duration Change Inactive Duration in seconds of the T305 timer. This timer is used to detect the absence of a REL response to a DISC sent over an ISDN interface when tones and announcements are not being played. The range and default for this timer depend on the Protocol variant field, as follows.
  • Telcordia National ISDN 2: Range 2 - 60 seconds, default 4 seconds.
  • DMS-100 or DMS-250: Range unlimited, default 30 seconds.
  • 5ESS National or 5ESS Custom: Range unlimited, default 4 seconds.
T308 timer duration Change Inactive Duration in seconds of the T308 timer. This timer is used to detect the absence of a REL COMPLETE response to a REL sent over the ISDN interface. The range and default for this timer depend on the Protocol variant field, as follows.
  • Telcordia National ISDN 2: Range 2 - 10 seconds, default 4 seconds.
  • All other variants: Range unlimited, default 4 seconds.
T309 timer duration Change Inactive Duration in seconds of the T309 timer. This timer is used to determine when to release active calls after the ISDN layer 2 has failed. Range: 10 - 90 seconds if Protocol variant is Telcordia National ISDN 2, unlimited for other variants. Default: 90 seconds (for all variants). The range and default for this timer depend on the Protocol variant field, as follows.
  • Telcordia National ISDN 2: Range 10 - 90 seconds, default 90 seconds.
  • All other variants: Range unlimited, default 90 seconds.
For ETSI-based variants, you are recommended to set this timer to a value equal to (N200 + 1) * (T200 + 2s), where N200 and T200 are standard ISDN layer 2 parameters.
T310 timer duration Change Inactive Duration in seconds of the T310 timer. This timer is used to time out calls where no ALERT, CONN or DISC is received over an ISDN interface following a CALL PROC. The range and default for this timer depend on the Protocol variant and Usage fields, as follows.
  • Telcordia National ISDN 2, 5ESS National or 5ESS Custom, User side: Range unlimited, default 30 seconds.
  • Telcordia National ISDN 2, Network side: 3 - 10 seconds (value must be greater than the value of T303 timer duration), default 10 seconds.
  • 5ESS National or 5ESS Custom, Network side: Range unlimited, default 10 seconds.
  • DMS-100 or DMS-250 (either usage): Range unlimited, default 10 seconds.
T313 timer duration Change Inactive This field is visible only for user-side profiles. Duration in seconds of the T313 timer. This timer is used to limit the time spent waiting for a CONN ACK message. Range: unlimited. The default is 4 seconds.
T316 timer duration Change Inactive Duration in seconds of the T316 timer. This timer is used to detect a missing response to a RESTART message. The range and default for this timer depend on the Protocol variant field, as follows.
  • Telcordia National ISDN 2: Range 10 - 120 seconds, default 30 seconds.
  • DMS-100 or DMS-250: Range unlimited, default 120 seconds.
  • 5ESS National or 5ESS Custom: Range unlimited, default 30 seconds.
T321 timer duration Change Inactive Duration in seconds of the T321 timer. This timer is used to control D-channel re-establishment after failure when using D-channel backup procedures. The range and default for this timer depend on the Protocol variant field, as follows.
  • Telcordia National ISDN 2: Range 30 - 400 seconds, default 40 seconds.
  • DMS-100 or DMS-250: Range unlimited, default 40 seconds.
  • 5ESS National or 5ESS Custom: Range unlimited, default 50 seconds.
Changing this value does not have any effect on an already active interface using this profile until the interface is deactivated and reactivated (or until a software protection switch occurs).
T322 timer duration Change Inactive Duration in seconds of the T322 timer. This timer is used to retransmit STATUS_ENQUIRY messages when no response is received to the previous one. The range and default for this timer depend on the Protocol variant field, as follows.
  • Telcordia National ISDN 2: Range 2 - 10 seconds, default 4 seconds.
  • All other variants: Range unlimited, default 4 seconds.
T402 timer duration Change Inactive Duration in seconds of the T402 timer. This timer is the time after a local analogue called party has gone on hook before the call should be released. Range: 10 - 12 seconds. The default is 12 seconds.
Tprog timer duration Change Inactive Duration in minutes of the Tprog timer. This timer is used in a progressing state before alerting or connect. Range: 3 - 7 minutes. The default is 5 minutes.
Trest timer duration Change Inactive Duration in seconds of the Trest timer. This timer is used to initiate restart procedures on out of service B-channels on an ISDN PRI. Range: 30 - 600 seconds. The default is 120 seconds.
T(DL re-establish) timer duration Change Inactive Duration in milliseconds of the T(DL re-establish) timer. This timer is used to control data link re-establishment after a failure or when it has been released. Range: 100 - 10000 (0.1 - 10 seconds). The default is 1000 (1 second).
Tserv duration Change Inactive This field appears only if Protocol variant is 5ESS National. Duration in milliseconds of the Tserv timer. This timer is used to control switchover to the backup D-channel if SERVICE / SERVICE ACK message exchange on the active channel does not complete within the specified time. The default is 300 seconds.
Maximum number of invalid messages allowed on a call Change Inactive Maximum number of invalid messages received on a call for which a STATUS message is returned before the call is cleared. Range: 1 - 8. The default is 8.
Maximum number of protocol errors allowed per hour Change Inactive Maximum number of protocol errors not associated with a call that should be tolerated over an ISDN interface in an hourly period. Range: 2 - 128. The default is 40.
Fix bits Change Inactive Options that control the detailed behaviour of the NE when communicating with remote ISDN equipment. You should not need to modify these settings except during integration or interoperability testing with new ISDN equipment, or as instructed by MetaSwitch support personnel. If required, select one or more of the following values:
  • Send Facility Information Element in SETUP message
    Accessing CNAM information may require a database lookup in an external server.
    If this value is set, the database lookup is performed before sending the initial SETUP message (this message includes the CNAM information, if any).
    If this value is not set, locally configured CNAM information will be sent in the initial SETUP, but any CNAM information obtained from an external lookup will be sent after the SETUP in a subsequent Facility message.
    This value must not be set if Protocol variant is DMS-100 or DMS-250.
  • Use Display Information Element for CNAM
    Send Calling Name information in the Display Information Element instead of in the Facility Information Element. This value can be set only if Send Facility Information Element in SETUP message is also set. It must not be set if Protocol variant is DMS-100 or DMS-250.
  • Do not send PRI-scope RESTART
    The remote equipment does not support the PRI-scope RESTART message. Instead, send a DS1-scope RESTART message for each DS1 in the PRI, resetting all the B-channels on that DS1. (If Do not send DS1-scope RESTART is also set, the NE does not send either PRI-scope or DS1-scope RESTARTs.)
  • Do not send DS1-scope RESTART
    The remote equipment does not support the DS1-scope RESTART message. Instead, send an individual RESTART message for each B-channel on the DS1. This value must be set if Protocol variant is DMS-100 or DMS-250.
  • Does not support channel negotiation
    Specify an exclusive (not preferred) B-channel in the outgoing SETUP message, and treat the B-channel specified in the incoming SETUP message as exclusive (do not negotiate) even if it is specified as preferred. This value must be set if Protocol variant is DMS-100 or DMS-250.
  • Play announcements when error conditions occur
    Play an announcement to the user if an error occurs such as a dialing pattern that is not valid. If this fixbit is not set, the NE sends a release cause code to the remote equipment but does not provide the announcement.
Reference count Read only This field tracks the count of ISDN Primary Rate Interfaces that refer to this profile. If one or more ISDN Primary Rate Interfaces refer to this profile, it cannot be deleted or disabled.
Requested status Read only Specifies whether an administrator has attempted to enable the ISDN Interface Profile. 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 ISDN Interface Profile. Values:
  • Enabled
    The object has been enabled.
  • Disabled
    The object has not been enabled or has been disabled.