Automatic congestion level: Information sent to the node to indicate that a particular level of congestion exists at the sending node.

Backward call indicators: Information relating to the characteristics of the connection, signaling path and called party sent in the backward direction.

Call diversion information: Information sent in the backward direction indicating the redirecting reason and the notification subscription option of the redirecting user.

Call diversion treatment indicators: Information sent in the forward direction concerning treatment of call diversion.

Call history information: Information sent in the backward direction to indicate the accumulated propagation delay of a connection.

Call offering treatment indicators: Information sent in the forward direction concerning treatment of call offering.

Call reference: Information identifying a particular call.

Call transfer number: Information sent in both directions to identify each of the users involved in a call transfer.

Call transfer reference: Information used to convey a reference number associated with the ECT supplementary service.

Called directory number: Information to indicate the directory number. The directory number is a number in the national numbering scheme that is allocated to a customer for a telephony service.

Called IN number: Information indicating the number which was received in the SSP as called party number in IAM and SAM messages.

Called party number: Information to identify the called party.

Calling party number: Information sent in the forward direction to identify the calling party.

Calling party's category: Information sent in the forward direction indicating the category of the calling party and, in case of semi-automatic calls, the service language to be spoken by the incoming, delay and assistance operators.

Carrier selection information: Information sent in the forward direction to indicate the method (namely call per call or preselection) being used to invoke carrier selection.

Cause indicators: Information sent in either direction indicating the reason for sending the message (e.g. release message).

CCNR possible indicator: Information sent in ACM (subscriber free)/CPG (alerting) to indicate the possibility to invoke a possible succeeding CCNR service request.

CCSS: Information sent in an initial address message indicating that a call is a CCBS or a CCNR call as defined in the CCBS or CCNR supplementary service.

Charged party identification: Information identifying the charged party, e.g. the account number.

Circuit assignment map: Information sent in the forward direction to identify the circuits used for an N ´ 64 kbit/s connection.

Circuit group supervision message type: Information sent in a Circuit Group Blocking or Unblocking message, indicating that blocking (unblocking) is maintenance oriented or hardware oriented.

CIC group supervision message type: Information sent in a CIC Group Blocking or Unblocking message, indicating that blocking (unblocking) is maintenance oriented.

Circuit/CIC state indicator: Information indicating the state of a circuit/CIC according to the sending node.

Closed user group interlock code: Information uniquely identifying a closed user group within a network.

Coding Decoding Processing parameter: Information sent in the Initial Address message, in support of DME tandeming avoidance procedure. This parameter indicates whether the voice call is compressed and the type of voice compression used.

Collect call request: Information sent in the forward direction indicating whether or not a call is a collect call.

Conference treatment indicators: Information sent in both directions concerning treatment of a multi-party call.

Connected number: Information sent in the backward direction to identify the connected party.

Connection request: Information sent in the forward direction on behalf of the signaling connection control part requesting the establishment of an end-to-end connection.

Continuity indicators : Information sent in the forward direction indicating whether or not the continuity check on the outgoing circuit was successful. A continuity check successful indication also implies continuity of the preceding circuits and successful verification of the path across the exchange with the specified degree of reliability.

Continuity indicators (BICC): Information sent in the forward direction indicating that the establishment of the bearer is complete up to and including the SN sending the COT message.

Correlation id: Information used by the SCF for correlation with a previous connection.

Display information: Information sent in either direction indicating a text string to be sent to the user.

Echo control information: Indicators used to request activation and deactivation of echo control devices, and to respond to such requests.

End of optional parameters: The end of optional parameters field indicates that there are no more optional parameters in the message.

Event information: Information indicating the type of event which caused a call progress message to be sent.

Facility indicator: Information sent in facility related messages identifying the facility or facilities with which the message is concerned.

Forward call indicators: Information relating to the characteristics of the connection, signaling path and calling party sent in the forward direction.

Forward GVNS: Information sent in the forward direction used for a GVNS call to convey GVNS related information.

Generic digits: Digit information, which is not suitable to be sent within numbering address parameter, sent in either direction to convey information between nodes due to a supplementary service.

Generic notification: Information sent in either direction intended to provide supplementary service notification to a user.

Generic number: Number information sent in either direction to enhance network operation or for supplementary services.

Global call reference: Information sent in forward direction to uniquely identify a call and correlate activities associated with that call.

Hop counter: Information sent in the forward direction to minimize the impact of looping. The initial count determines the maximum number of contiguous ISUP interexchange circuits (ISUP) / call control associations (BICC) that are allowed to complete the call, assuming all subsequent intermediate nodes decrement the hop counter.

Information indicators: Information identifying the optional parameters included in a message.

Information request indicators: Information identifying the optional parameters requested in a message.

IN service compatibility: Information sent in either direction indicating the IN Services being invoked in a call.

Inter-nodal traffic group identifier: Information sent in the forwards direction identifying to which logical traffic group the call belongs. This identifier is of significance only between two adjacent nodes.

Location number: Information sent to identify the geographical area (e.g. region, country, city, etc.) of the origin of a call. It is primarily intended to provide services for mobile originated calls.

Loop prevention indicators: Information sent in association with a request (or response to a request) when the loop prevention procedure is performed in the ECT supplementary service.

MCID request indicator: Information sent in the backward direction to request the identity of the calling party for the purpose of malicious call identification.

MCID response indicator: Information sent in the forward direction to respond to a MCID request and indicating whether or not the MCID information is available.

Message compatibility information: Information sent in either direction indicating how a node should react in case this message is unrecognized.

MLPP precedence: Information relating specifically to the multi-level precedence and preemption service.

Nature of connection indicators: Information relating to the transmission path used on a connection.

Network management controls: Information sent in the forward direction concerning network management related action for a call.

Network routeing number: Information to indicate the network routeing number. The network routeing number is a number used by the network to route a call.

Network specific facility: Service related information transparently transferred in either direction between the local node and the identified network which contracts the service. The information is significant to both user and the identified network.

Number portability forward information: Information sent in the forward direction concerning treatment of number portability.

Optional backward call indicators: Information relating to the characteristics of the connection, signaling path and called party sent in the backward direction.

Optional forward call indicators: Information relating to the characteristics of the connection, signaling path and called party sent in the forward direction.

Original called number: Information sent in the forward direction when a call is redirected and identifies the original called party.

Original called IN number: Information sent in the forward direction indicating the original called IN number, if multiple IN interactions have taken place.

Origination ISC point code: Information sent in the initial address message of an international call, indicating the point code of the originating ISC.

Parameter compatibility information: Information sent in either direction indicating how a node should react in case the parameter is unrecognized.

Pivot capability: General information about allowed operation of pivot routeing.

Pivot counter: Information indicating the number of pivot attempts (successful and unsuccessful) that a call has undergone.

Pivot routeing backward information: Information sent in the backward direction in support of pivot routeing.

Pivot routeing forward information: Information sent in the forward direction in support of pivot routeing.

Pivot routeing indicators: Information used in the FAC message to indicate the pivot routeing action to be performed at the next (failure action) or previous (request action or cancel action) node.

Pivot status: Information used to inform nodes regarding the possibility that an offer to pivot route will be accepted later.

Propagation delay counter: Information sent in forward direction to indicate the propagation delay of a connection. This information is accumulated whilst the parameter is transferred through the network. The propagation delay information is represented by a counter counting in integer multiples of 1 ms.

QoR capability: Information sent in the forward direction to indicate that at least one node in the connection is able to perform the query to the database as described in the QoR procedures.

Range and status: Information sent in a group supervision message (e.g. Circuit/CIC Group Blocking) to indicate the range and status of circuits/CIC values affected by the action in the message.

Redirect backward information: Information sent in the backward direction in support of redirection.

Redirect capability: Information sent in the forward direction to indicate that at least one node in the connection is able to redirect the call and the call states in which the procedure is possible.

Redirect counter: Information indicating the number of invocations of redirection that a call has undergone.

Redirect forward information: Information sent in the forward direction in support of redirection.

Redirect status: Information used to inform nodes regarding the possibility that an offer to redirect will be accepted later.

Redirecting number: Information sent in the forward direction when a call is diverted, indicating the number from which the call was diverted.

Redirection information: Information sent in either direction giving information about call redirection or call rerouteing.

Redirection number: Information sent in the backward direction indicating the number towards which the call must be redirected or has been forwarded.

Redirection number restriction: Information sent in the backward direction indicating whether the diverted to user allows the presentation of his number.

Remote operations: The Remote Operations parameter is used to indicate the invocation of a supplementary service identified by an operation value and also carry the result or error indications depending on the outcome of the operation.

SCF id: Information indicating the SCF identifier.

Service activation: Information sent in either direction to indicate the invocation, acceptance or rejection of supplementary services, when no service associated parameter is to be sent.

signaling point code: Information sent to identify the signaling point in which an event occurred.

Subsequent number: Additional called party address digits sent subsequent to the sending of the called party number parameter.

Suspend/resume indicators: Information sent in the suspend and resume messages to indicate whether suspend/resume was initiated by an ISDN subscriber or by the network.

Transit network selection: Information sent in the initial address message indicating the transit network requested to be used in the call.

Transmission medium requirement: Information sent in the forward direction indicating the type of transmission medium required for the connection (e.g. 64 kbit/s unrestricted, speech).

Transmission medium requirement prime: Information sent in the forward direction indicating the fallback connection type in case of fallback.

Transmission medium used: Information sent in the backward direction indicating a resulting fallback connection type used for a call after fallback has occurred.

UID action indicators: Information sent in the backward direction to instruct preceding nodes to enable a user interactive dialogue to occur.

UID capability indicators: Information sent in the forward direction to inform succeeding nodes that on request a user interactive dialogue is possible.

User service information: Information sent in the forward direction indicating the bearer capability requested by the calling party.

User service information prime: Information sent in the forward direction indicating the additional bearer capability requested by the calling party.

User teleservice information: Information sent in the initial address message indicating the Higher Layer Compatibility information requested by the calling party.

User-to-user indicators: Information sent in association with a request (or response to a request) for user-to-user signaling supplementary service(s).

User-to-user information: Information generated by a user and transferred transparently through the network between the originating and terminating nodes.

See Also,

What is SS7 and ISUP?

SS7 - ISUP Messages

What is ISDN?

SS7 Network and Node Architecture

What is Software Quality Assurance and Testing?

What is Reliability? Terms and Concepts.

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