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Message Parameters

Overview

The ISUP parameters in this section are used in the SS7 ISUP Message Format Configure API message.

Definitions

The table below indicates the IDs and descriptions for ISUP parameters. Some parameters are marked with a number indicating the telecommunications standard supported by a parameter:

1 ANSI

2 ITU

The parameters that are not marked by a number are supported in both ANSI and ITU standards.

Parameter Name | ID | Description
--- | --- | ---
Access Delivery Information 2 | 0x2E | Information sent in the backward direction indicating that a SETUP message was generated at the destination access.
Access Transport | 0x03 | Information generated on the access side of a call and transferred transparently in either direction between the originating and terminating local exchanges. The information is of significance to both users and local exchanges.
Automatic Congestion Level | 0x27 | Information optionally included in a Release Message and sent to the exchange at the other end of a circuit to indicate that a particular level of congestion exists at the sending exchange.
Backward Call Indicator (BCI) | 0x11 | Information sent in the backward direction consisting of the charge indicator, called party's status indicator, called party's category indicator, end-to-end method indicator, interworking indicator, end-to-end information indicator, ISDN User Part indicator, holding indicator, ISDN access indicator, echo control device indicator, and SCCP method indication.
Business Group 1 | 0xC6 | Information sent in either direction to indicate the identity of the Multi-Location Business Group associated with a number (e.g. the Calling Party Number), the identity of a Subgroup within that Multilocation Business Group and the Line Privileges allocated to the number.
Call Diversion Information 2 | 0x36 | Information sent in the backward direction indicating the redirection reason and the notification subscription option of the redirecting user.
Call History Information 2 | 0x2D | Information sent in the backward direction to indicate the accumulated propagation delay of a connection.
Call Reference | 0x45 | Circuit independent information identifying a particular call.
Called Party Number (CDPN) | 0x04 | Information sent in the forward direction to identify the called party and consisting of the odd/even indicator, nature of address indicator, numbering plan indicator, and address signals.
Calling Party Number (CGPN) | 0x0A | Information sent in the forward direction to identify the calling party and consisting of the odd/even indictor, nature of address indicator, numbering plan indicator, address presentation restriction indicator, screening indicator, and address signals.
Calling Party's Category (CPC) | 0x09 | Information sent in the forward direction indicating the category of the calling party, e.g. ordinary subscriber, test call.
Cause Indicators | 0x12 | Information sent in either direction consisting of the coding standard, location, cause value and diagnostics. It indicates the reason for sending the message in which it is contained, e.g. the Release, Address complete or Confusion messages, and identifies the network in which the message originated, e.g. local network, transit network, remote local network.
Charge Number 1 | 0xEB | Information sent in either direction indicating the chargeable number for the call and consisting of the odd/even indicator, nature of address indicator, numbering plan indicator, and address signals.
Circuit Assignment Map 1 | 0x25 | Information identifying the map format and the circuits in a multi-rate connection. For the DS 1 map format it identifies the DS0 circuits constituting a NxDS0 connection. The circuit assignment map is used only for NxDS0 calls when non-contiguous time slot allocation is used.
Circuit Group Characteristics Indicator 1 | 0xE5 | Information sent in response to a request for circuit validation, indicating the characteristics of the concerned circuit group in terms of carrier type, double seizing control, alarm handling and continuity check requirements.
Circuit Group Message Supervision Message Type Indicator | 0x15 | Information sent in either direction in a circuit group supervision message and consisting of the circuit group blocking type indicator.
Circuit Identification Name 1 | 0xE8 | Information identifying the exchanges on which a circuit group terminates and the number of each trunk within that group.
Circuit State Indicator | 0x26 | Information indicating the state of a circuit according to the sending exchange.
Circuit Validation Response Indicator | 0xE6 | Information indicating the far-end results of a circuit validation test.
Closed User Group Interlock Code 2 | 0x1A | Information uniquely identifying a closed user group within a network.
Common Language Location Information Code (CLLI) 1 | 0xE9 | Information used for circuit validation to identify a switching office by town, state, and building subdivision. (COMMON LANGUAGE is a registered trademark and CLLI is a trademark of Bell Communications Research, Inc.)
Connected Number 2 | 0x21 | Information sent in the backward direction to identify the connected party.
Connection Request | 0x0D | Information sent in the forward direction on behalf of the Signaling Connection Control Part requesting the establishment of an end-to-end connection and consisting of the local reference, point code, protocol class, and credit.
Continuity Indicators | 0x10 | 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.
Echo Control Information 2 | 0x37 | Information sent in the forward direction indicating whether or not an outgoing half echo control device is included in the connection.
Egress 1 | 0xC3 | Information sent in the forward direction by the first incoming exchange in the terminating exchange area, to indicate network specific attributes associated with the terminating exchange, e.g. the interexchange carrier, the point of interconnection, and type of terminating access service.
End of Optional Parameters | 0x00 | The end of optional parameters field indicates that there are no more optional parameters in the message.
Event Information | 0x24 | Information sent in either direction consisting of the event indicator and event presentation restriction indicator.
Facility Indicators 2 | 0x18 | Information sent in facility related messages identifying the facility or facilities with which the message is concerned.
Forward Call Indicator | 0x07 | Information sent in the forward direction consisting of the incoming international call indicator, end-to-end method indicator, interworking indicator, end-to-end information indicator, ISDN User Part indicator, ISDN User Part preference indicator, ISDN access indicator, and SCCP method indicator.
Freephone Indicators 2 | 0x41 | No description available.
Generic Address 1 | 0xC0 | Information in the form of an address pertaining to a supplementary service (e.g., dialed number, destination number) and including type of address, nature of address and numbering plan indications.
Generic Digits 1 | 0xC1 | Information in the form of digits pertaining to a supplementary service, (e.g. account code, authorization code, private network class mark) and including type of digits and encoding method indicators.
Generic Name 1 | 0xC7 | Information sent in the forward direction containing specific name related information.
Generic Notification 2 | 0x2C | Information sent in either direction intended to provide supplementary service notification to a user.
Generic Number 2 | 0xC0 | A number information sent in either direction to enhance network operation or for supplementary services.
Generic Reference 2 (reserved) |  | For further study.
Hop Counter (ITU – reserved) | 0x3D | Information sent in the forward direction to minimize the impact of lAM looping. The initial count determines the maximum number of contiguous SS7 interexchange circuits that are allowed to complete the call, assuming all subsequent intermediate exchanges decrement the hop counter.
Information Indicators | 0x0F | Information sent in either direction consisting of the calling party address response indicator, connected address response indicator, calling party's category response indicator, charge information response indicator, and solicited information indicator.
Information Request Indicators | 0x0E | Information sent in either direction consisting of the calling party address request indicator, connected address request indicator, calling party's category request indicator, charge information request indicator, malicious call identification request indicator, and holding indicator.
Jurisdiction 1 | 0xC4 | Information sent in the forward direction indicating the geographic origination of the call.
Location Number 2 | 0x3F | Information sent to indicate the location of a user in the term of an E.164 number.
MCID Request Indicator 2 | 0x3B | Information sent in the backward direction to request the identity of the calling party for the purpose of malicious call identification.
MCID Response Indicator 2 | 0x3C | 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 2 | 0x38 | Information sent in either direction indicating how an exchange should react in case this message is unrecognized.
MLPP Precedence 2 | 0x3A | Information sent in the precedence parameter identifying the network resources to which the Multi-level Precedence and Preemption supplementary service is applicable for the call.
Nature of Connection Indicator | 0x06 | Information sent in the forward direction consisting of the satellite indicator, continuity check indicator, and echo control device indicator.
Network Specific Facilities 2 | 0x2F | Service related information transparently transferred in either direction between the local exchange and the identified network, which contracts the service. The information is significant to both user and the identified network.
Network Transport 1 | 0xEF | A Parameter sent in either direction for the purpose of transporting other ISDN User Part parameters transparently across transit exchanges.
Notification Indicator 1 | 0xE1 | Information Sent in either direction intended to provide supplementary service related notification to a user.
Operator Services Information 1 | 0xC2 | Information sent in the forward direction between operator services entities primarily identifying charging and service type options.
Optional Backward Call Indicators | 0x29 | Information sent in the backward direction consisting of the in-band information indicator, the call forwarding may occur indicator and the user-network interaction indicator.
Optional Forward Call Indicators 2 | 0x08 | Information sent in the forward direction consisting of CUG, segmentation, and connected line identity request information.
Original Called Number | 0x28 | Information sent in the forward direction to indicate, in the case of call redirection (e.g., call forwarding), the number of the user who initiated the initial redirection.
Originating Line Information (OLI) 1 | 0xEA | Information sent in the forward direction, indicating a toll class of service for the call.
Origination ISC Point Code 2 | 0x2B | Information sent in the initial address message of an international call, indicating the point code of the originating ISC.
Outgoing Trunk Group Number (OTGN) |  | Information sent in the backward direction indicating the trunk group selected at an outgoing gateway. For intra-network use only.
Parameter Compatibility Information 2 | 0x39 | Information sent in either direction indicating how an exchange should react in case the parameter is unrecognized.
Precedence 1 | 0x3A | Information sent in the forward direction in association with the invocation of the Multi-Level Precedence and Preemption (MIYP) supplementary service, consisting of the look-ahead for busy indication, the precedence level, network identity, and the MI2P service domain.
Propagation Delay Counter 2 | 0x31 | Information sent in the forward direction to indicate the propagation delay of a connection. This information is accumulated while the parameter is transferred through the network. The propagation delay information is represented by a counter counting in integer multiples of 1 ms.
Range and Status (R&S) | 0x16 | Information sent in either direction in circuit group supervision messages consisting of the range and status.
Redirecting Number | 0x0B | Information sent in the forward direction indicating the number from which the call was last redirected and consisting of the nature of address indicator, numbering plan indicator, address presentation restriction indicator, and address information (signals).
Redirection Information | 0x13 | Information sent in the forward direction consisting of the original redirecting reason redirection counter and redirecting reason.
Redirection Number 2 | 0x0C | Information sent in the backward direction indicating the number towards which the call must be rerouted or has been forwarded.
Redirection Number Restriction 2 | 0x40 | Information sent in the backward direction indicating whether the diverted-to user allows the presentation of his number.
Remote Operations | 0x32 | 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.
Service Activation | 0x33 | 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 2 | 0x1E | Information sent in a release message to identify the signaling point in which the call failed.
Special Processing Request 1 | 0xE5 | Information sent in the forward direction from a private network access node to service node in the public switched network to indicate that the call requires special processing at that node e.g. private network number translation or verification of authorization codes.
Subsequent Number 2 | 0x05 | Information sent which includes E/O indicator, address signals and filler.
Suspend/Resume Indicators | 0x22 | Information sent in either direction consisting of the suspend/resume indicator
Transaction Request 1 | 0xE3 | Information sent in the Initial Address Message (lAM) to help continue call processing, using Transaction Capabilities (TC), associated with a given call during an assist or hand-off procedure.
Transit Network Selection (TNS) | 0x23 | Information sent in the forward direction indicating the transit network(s) requested for the routing of the call and consisting of the type of network identification, network identification plan, and network identification.
Transmission Medium Requirement 2 | 0x02 | Information sent in the forward direction indicating the type of transmission medium required for the connection (e.g. 64Kbps unrestricted speech).
Transmission Medium Requirement Prime 2 | 0x3E | Information sent in the forward direction indicating the fallback connection type in case of fallback.
Transmission Medium Used | 0x35 | Information sent in the backward direction indicating the resulting fallback connection type used for a call after the fallback has occurred.
User Service Information (USI) | 0x75 | Information sent in the forward direction indicating the bearer capability requested by the calling party and including as a minimum the coding standard, information transfer capability, transfer mode, and information transfer rate.
User Service Information Prime | 0x30 | Information sent in the forward direction indicating the preferred bearer capability requested by the calling party.
User Teleservice Information 2 | 0x34 | Information sent in the initial address message indicating the Higher Layer Compatibility information requested by the calling party.
User-to-User Indicators | 0x2A | Information sent in association with the response to a request for user-to-user signaling supplementary service(s).
User-to-User Information | 0x20 | Information generated by a user and transferred transparently through the intermediate exchanges between the originating and terminating local exchanges.

See Integrated Services Digital Network User Part.
See Signaling System Number Seven.
American National Standards Institute. ANSI administers and coordinates the U.S. voluntary standardization and conformity assessment system for the
telecommunications industry. More details on these standards may be
viewed at www.ansi.org.
International Telecommunications Union (UN)
See Integrated Services Digital Network.
The condition of a component at a given instant. The current "context" of a PPL object, such as Idle, Seizing, Answered. In PPL files, a State is represented by a circle.
SCCP. The signaling connection and control part of the SS7 signaling protocol. For example, performs Global Title Translations (GTT), Subsystem Management.
In PPL, a condition that, when met, drives a state machine (PPL Component) from one state to another, by invoking an associated Primitive. In PPL files, an Event is marked by an arrow and text.
Address format for ISDN networks. The international public telecom-munications numbering plan. A standard set by ITU-T for addressing telephone numbers. See ITU Recommendation E.164 (1991).
A number that addresses a node in a SS7 network.