ISUP Group - ITU

The ISUP Group object pane for ITU defines the configuration for a group of ISUP channels. The contents of the pane will vary depending on whether the associated SS7 Stack is ANSI or ITU.

 

ClientView Pane

IMG EMS > Routing Configuration > Channel Groups > Channel Group (SS7) > ISUP Group

SC_ISUP_Group_ITU.png

 

Maximum Objects

512 per SS7 Channel Group

 

Related Topics and Dependencies

ISUP Group - ANSI

ISUP Group - JTISUP

 

Field Descriptions:

OPC - DPC

This field has a drop-down list populated with OPC-DPC combinations from previously configured SS7 Stack (OPC) and SS7 Route (DPC) configurations.

 

Glare Rule

Indicates how simultaneous incoming and outgoing seizures of the same SS7 channel are resolved.

Drop Outgoing Call - The incoming seizure is denied.

Drop Incoming Call - The outgoing seizure is denied.

Odd/Even - The incoming seizure is denied if:

> The OPC value is less than the DPC value and the CIC number is odd or,

> The OPC value is greater than the DPC value and the CIC number is even (ITU-T Recommendation Q.767).

 

Incoming Continuity Check

Configures the behavior when receiving an IAM with Continuity Check required on this circuit.

Wait for COT (default) - Wait for the COT before sending the INVITE or Setup (Outgoing IP channel groups).

Do not wait for COT - Propagate the IAM with 'Continuity check required on previous circuit' (Outgoing SS7 channel groups).

 

Out Continuity Check

This field indicates how frequently outgoing calls on this SS7 channel undergo an automatic continuity check.

 

None (Default) - No Continuity Checks Performed

1:xx - One out of every X calls undergoes a Continuity Check

1:02 - One of every 2 calls undergoes a Continuity Check.

1:03 - One of every 3 calls undergoes a Continuity Check.

1:04 - One of every 4 calls undergoes a Continuity Check.

1:05 - One of every 5 calls undergoes a Continuity Check.

1:06 - One of every 6 calls undergoes a Continuity Check.

1:07 - One of every 7 calls undergoes a Continuity Check.

1:08 - One of every 8 calls undergoes a Continuity Check.

1:09 - One of every 9 calls undergoes a Continuity Check.

1:10 - One of every 10 calls undergoes a Continuity Check.

1:11 - One of every 11 calls undergoes a Continuity Check.

1:12 - One of every 12 calls undergoes a Continuity Check.

1:13 - One of every 13 calls undergoes a Continuity Check.

1:14 - One of every 14 calls undergoes a Continuity Check.

1:15 - One of every 15 calls undergoes a Continuity Check.

1:16 - One of every 16 calls undergoes a Continuity Check.

 

Satellite Circuit

This field indicates if this SS7 channel makes use of a satellite facility.

 

No (Default)

Yes

 

CIC Service Rule

Indicates which SS7 message is sent when an SS7 stack on the 2020 IMG takes an SS7 channel out-of-service.

Block - The SS7 stack sends an SS7 Blocking (BLO) message. The SS7 stack will then send an SS7 Unblocking (UBL) message when the 2020 IMG puts the SS7 channel back in service.

No Bloc - The SS7 stack does not send SS7 message. This stack will send an SS7 Reset Circuit (RSC) message when the 2020 IMG puts this SS7 channel back in service.

No Action - The SS7 stack does not send an SS7 message.

 

Hop Counter

Indicates the number of switches that can have processed a call before the call is dropped.

Off (Default) - Feature is Disabled. Switch will not reject call.

01-31 - Select from drop down list the number of switches that can process the call before call is dropped.

 

State transitions

Group Operations

Individual Operations(B/U)

Individual Operations(R/B/U)

 

Echo Suppression

Echo Suppression is designed to eliminate echo signals in one direction caused by signals in the other direction. Helps prevent the individual talking on a telephone line from hearing his or her own voice.

Echo Suppressor Not Present (Default) - Echo Suppression is disabled.

Echo Suppressor Present - Echo Suppression is enabled

 

Max # of CdPN Digits (IAM)

For outgoing SS7 calls, when the number of digits reaches this value the 2020 IMG sends an IAM and the remaining digits are sent in a SAM (Subsequent Address Message).

Signaling Variant Range
ITU-97, ETSI-V3 1-24 or "OFF" for no limit
ITU-93, CCITT-88, ETSI-V2, ETSI-V1 1-16

 

Alert/Answer

Determines if the alerting/answering of the call will be setup using ACM/ANM combination or using CON.

 
ANM/ACM or CON (Default)
CON
ANM/ACM

 

Parameter Compatibility Checking

Information sent in either direction indicating how a node should react in case the parameter is unrecognized. The Parameter Compatibility Checking Determines if the 2020 IMG will check for incompatible parameters in an ISUP message.

On (Default) - Checks for incompatible parameters

Off - Does NOT check for incompatibility parameters

 

Parameter Compatibility Pass On

Determines the behavior when receiving an incompatible parameter in an ISUP message, whether to pass it to the far end or not.

On (Default) - Pass the parameter on

Off - Do Not Pass

 

Overload Handling

Overload handling determines how to respond when the 2020 IMG starts getting busy (low idle time). The 2020 IMG indicates to the far end that it is overloaded by either releasing the call (Send REL message) or by sending an OLM (Overload Message).

Send REL - Send Release message.

Send OLM - Send Overload Message

 

UPT upon UPU

This configures how the 2020 IMG responds upon receiving a UPU (User Part Unavailable) from the far end of the CIC. If enabled, the 2020 IMG will send a UPT (User Part Test) message continuously until any ISUP message is received from the far end of the CIC.

Yes - enable

No (Default) - disable

 

Transmission Medium

Information sent in the forward direction indicating the type of transmission medium required for the connection. The Transmission Medium field determines the value of the transmission medium parameter in any IAM message referring to that CIC. The selections are displayed below.

 
Speech (Default)
64 Kbit Unrestricted
3.1 KHz audio

 

Propagation Delay

If Propagation Delay is set to enabled and the 2020 IMG receives an IAM message with no Propagation delay specified, the propagated IAM message to the far end will contain the Propagation Delay counter parameter with the value set in the Propagation Delay Time field below. If the IAM message coming to the 2020 IMG already contains a propagation delay value, the propagated IAM message to the far end will contain the Propagation Delay counter parameter with the value set to the sum of the incoming Propagation Delay Time field below.

Off (Default) - 2020 IMG will not send the propagation delay counter message.

On - Propagation Delay is enabled and 2020 IMG will send the propagation delay counter message. See Propagation Delay description above.

 

Propagation Delay Time (MS)

If Propagation Delay field above is enabled and the 2020 IMG receives an IAM with no Propagation Delay Specified, the propagated IAM message to the far end will contain the Propagation Delay counter parameter with the value set in the Propagation Delay Time field.

 

History Passage

Off (Default) -

On -

 

Discard Privacy INFO

The selected option will be removed from the ISUP message. See Configuring SIP Privacy.

 

Off (Default)

Display Only

Generic Number Only

Display & Generic Number

Calling Party Only

Display and Calling Number

Calling, Display and Generic

 

TMR Values Allowed

Transmission Medium Requirement values are supported in ITU only. It contains the requirements for the bearer circuit capabilities that are needed for the call being setup. The choices are displayed below.

 
Speech
64 kbits/s unrestricted
3.1 KHz audio
Alternate Speech
Alternate 64 kbit/s unrestricted
64 kbits/s preferred
2x64 Kbits/s unrestricted

384 Kbits/s unrestricted

 

 

TMR Screening Cause Value

 
65 (Bearer Cap Not Implemented)
88 (Incompatible Destination)

 

LNP Routing Enable

Use this field to enable or disable Local Number Portability routing.

 

Disable (Default)

Enable

 

Refer to the Local Number Portability (LNP) topic for more information.

 

Link OOS Handling

Disable (Default) - Functionality is same as previous software. If Signaling Link goes Out Of Service, then the associated CIC's will go Out Of Service as well.

Enable - If signaling link goes Out Of Service all associated CIC's which are in the idle state will go Out Of Service. If any CIC's are in either the ringing or connected state the CIC's will not go Out Of Service until a later subsequent condition occurs. See SS7 Link OOS Handling for more information on configuration and functionality.

 

CUG (Closed User Group) Handling

The Closed User Group field adds to the 2020 IMG the ability to either pass or reject calls which have the CUG parameter (Interlock Codes) embedded in it. If CUG parameter is not in the incoming call then the call will be passed regardless of the selection in the CUGS Handling field. Select from drop down menu one of the selections below.

Important Note: The 2020 IMG doesn't process the data within the CUG parameter. The 2020 IMG accepts or rejects the call with the CUGS parameter based on the configuration.

Reject Calls (Default) - If 2020 IMG receives a call with the CUG parameters (Interlock Codes) it will reject the call with a cause code of 29 facility rejected. See Call Trace CUG Reject which is call trace of rejected call with CUG parameter.

Ignore - If 2020 IMG receives a call with the CUG parameters (Interlock Codes) it will pass the call. See Call Trace CUG Passed which is a call trace of a passed call with CUG parameter.

 

Transparent ISUP via SIP-T

The field Transparent ISUP via SIP-T is utilized when messaging is being received via SIP-T on incoming channel group and is being sent out of IMG via an SS7 ISUP Channel group. Before configuring verify that SIP-T is enabled and configured. See SIP Signaling and  SIP-T entity for more information on configuring/enabling SIP-T:

Once the SIP-T is configured then the Transparent ISUP via SIP-T field can be configured.

Disabled (Default) - When field is set to Disabled (Default) the IMG will function normally. Messages received via SIP-T will be processed through the IMG and any parameters that are added or modified through the IMG configuration will be modified and sent out the SS7 ISUP channel group in an outgoing IAM message.

Enabled - When field is set to Enabled any messages being received via SIP-T will be sent to the outgoing ISUP channel group unchanged regardless of the configuration set on the IMG. Any modifications or parameter overrides due to the configuration set on the IMG will be ignored.

 

 

Outgoing Parameter Compatibility Insertion

The IMG can be configured to add compatibility information to the BISUP portion of an outgoing IAM message. The compatibility information added are instructions of what to do when an exchange receives unrecognized signaling information. These parameters are invoked to ensure predictable network behavior.

False (Default) - Do not add the compatibility information to outgoing IAM optional parameters.

True - When True is selected, this opens multiple fields below it. The fields opened are the compatibility information that can be added to the outgoing IAM optional parameters. After selecting true, you will need to configure the compatibility fields below.

 

Transit at intermediate exchange

transit interpretation - If set to transit interpretation, the remaining indicators are ignored at the far end exchange.

end node interpretation - If it is set to end node interpretation, the actions in accordance with the setting of the remaining indicators are performed at the far end exchange.

 

Release Call

do not release call - The Call is not released if an unrecognized parameter is received at far end exchange.

release call - The Call is released if an unrecognized parameter is received at far end exchange.

 

Send Notification

If an unrecognized parameter is received at far end exchange and the Release Call indicator is set to do not release call then the following is true

do not send notification - no messages are sent

send notification - a confusion message is sent towards the exchange that sent the unrecognized information.

 

Discard Message

If an unrecognized parameter is received at far end exchange and the Release Call indicator is set to do not release call then the following is true

do not discard message (pass on) - the message is passed on to far end exchange.

discard message - The message is discarded as instructed.

 

Discard Parameter

If an unrecognized parameter is received at far end exchange and the Release Call indicator is set to do not release call then the following is true

do not discard parameter (pass on) - the parameter is passed on to the far end exchange.

discard parameter - The parameter is discarded as instructed.

 

Pass On Not Possible

If an unrecognized parameter is received at far end exchange and the Release Call indicator is set to do not release call then the following is true.

release call - call will be released and nothing is passed on.

discard message - The message is discarded as instructed.

discard parameter - The parameter is discarded as instructed.

 

Extension

Information sent in every octet in a multi-octet parameter field with variable length, indicating whether the octet is the last one or is followed by another one.

information continues through the next octet - decimal value is greater than 255 will require the use of the parameter extension mechanism.

last octet - decimal value is less than 255 will not require the use of the parameter extension mechanism.

 

Broadband/narrowband interworking

Information indicating reaction to be taken if unrecognized information is received at a broadband/narrow-band interworking point.

pass on - Pass the information on.

discard message - The message is discarded as instructed.

release call - call will be released and nothing is passed on.

discard parameter - The parameter is discarded as instructed.