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There is a subtle but very important difference in the UI between ISDN/BRI Signaling Groups and ISDN/PRI Signaling Groups. These differences appear in the Port and Protocol panels.

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1Port and Protocol

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Configuration Field

PRI (T1)

BRI

Fractional

(tick)

(error)

TEI Assignment

(error)

(tick)

TEI

(error)

(tick)

Creating an ISDN Signaling Group

To create an ISDN Signaling Group:

  1. From the Create Signaling Group drop down box at the top of the Signaling Group Table, select ISDN Signaling Group.

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    1Create ISDN Signaling Group

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Specifies whether or not the port is fractional. If selected, you must add a list of channels

Channel list Selection

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Specifies to which channels the Signaling Group is applied if the port is fractional

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Switch Variant

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Specifies the ISDN variant for this signaling group.

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Specifies the TEI to assign for BRI when set to user side. 0 through 63 are absolute values to assign. If signaling group is PRI or network side BRI this parameter is not used. This field is available only when the TEI Assignment Type is set to Static.

Note
  The value of 0 for Static TEI is valid only for NTT. Other BRI specifications allow a value of 0 through 63 for Static TEI.

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Send Calling Name

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Specifies whether or not the Q.931 SETUP message is sent to the far-end should include the DISPLAY Information Element (IE).
Available only when ISDN Side is set to User and the Switch Variant is set to NI2 or Euro-ISDN.

If this option is enabled, the DISPLAY IE is populated for NI2 or Euro-ISDN switch types, otherwise the DISPLAY IE is not populated for these switch types.

In general, the DISPLAY IE is populated according to ISDN communication standards. The NI2 and Euro-ISDN specifications state that the DISPLAY IE should not be populated. This option allows you to override that configuration for your environment.

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Specifies whether or not to include the Network Facility Extension and Interpretation APDU in ASN.1 for QSIG. All QSIG specific ISDN Signaling groups must be configured the same system-wide for this field.

 

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Channels and Routing - Field Definitions

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In the event of a "No Channel/Circuit available" release cause code, the specified cause code will be sent to the relevant protocol module. For more information see the list of Cause Codes.

NOTE: This attribute relates only to Inbound calls on the Signaling Group where applied.

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Play Inband Message post-disconnect

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Timer

Timer Definition

T301

Started when an ISDN call enters the alerting state (i.e.receive an ALERT message) and if it expires clears the call. Prevents the call from ringing forever.

T302

Specifies the time between digits in overlapped dialing.  If it expires it is assumed all digits have been received.

T303

Specifies the time after sending a ISDN SETUP message to wait for a response. First expiration will resend the SETUP and second expiration will fail the call.

T305

Specifies the time to wait after sending an ISDN DISCONNECT message to wait for the RELEASE message response. If it expires we then send an ISDN RELEASE message.

T308

Specifies the time to wait after sending an ISDN RELEASE message to wait for the RELEASE COMPLETE message response. First expiration will resend the RELEASE message and second expiration will send a RELEASE COMPLETE message.

T309

Specifies the time to wait after the D channel goes down for B channels with calls in the active state to wait for the D channel to come back up. If it expires and the D channel has not come back up the call on the B channel is cleared.

T310

Specifies the time to wait after receiving a CALL PROCEEDING message to wait for some form of call progress, i.e. a PROGRESS, ALERT or CONNECT message. If it expires the call is cleared.

T313

Specifies the time for user side ISDN to wait after sending a CONNECT message to wait for the CONNECT ACKNOWLEDGE message. If it expires then the call is cleared.

T314

Specifies the time to wait between SEGMENT messages for segmented message support in QSIG. If it expires all previously received SEGMENT messages are discarded and ignored.

T316

Specifies the time to wait after sending a RESTART message to wait for the RESTART ACKNOWLEDGE. First expiration will resend the RESTART message and second expiration will put the channel in local maintenance state for protocols that support service messaging. For protocols that don't support service messaging channel will be returned to the idle state.

T322

Specifies the time to wait after sending a STATUS ENQUIRY message to get the STATUS message response. First expiration will resent the STATUS ENQUIRY message and second expiration will clear an active call. Only started if T309 doesn't expire and the D channel comes back up before T309 expires on B channels with active calls.

T3M1(T323)

Specifies the time to wait after sending a SERVICE message to get the SERVICE ACKNOWLEDGE response. If it expires the SERVICE message will be resent. For NI-2 this is a maximum of 3 attempts before leaving the B channel in the state it was before and not changing its state.

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