View this file in pdf format. CCITT developed the transport technology used. The format of the BICC packet is shown in the following illustration: The B-ISDN User Part (B-ISUP) is applicable to international B-ISDN networks. In addition, the . of any kind for any errors contained herein or in connection with the .. Before using the SINAP/SS7 ISDN User Part (ISUP) Guide (R), . A list of the files that must be included in any application that calls this function. Associated with each user SAP (in the ISUP configuration file) is a switch type ( CCITT, ANSI, or ANSI) which the ISUP process uses to associate with its.

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Contents Contains the substance of the element, containing the primary information the element is intended to convey.

Every event in ISUP signaling generates a cause code number. The format of the BICC packet is shown in the following illustration: As a national option B-ISDN user part messages can be carried on the STM signalling link by means of signal units, the format of which is described in 2. Each optional parameter will include the parameter name one octet and the length indicator one octet followed by the parameter contents. It is also used by the Message Transfer Part to route the message towards its destination point.

Message Transfer Part – Level 2 MTP-2 is a signalling link which together with MTP-3 provides reliable transfer of signalling messages between two directly connected signalling points. The Routing Label indicates the Point Codes of the originating and destination nodes in the network; it also includes the Signalling Link Selection field that is used to select between the multiple routes an MSU could take between two nodes.

Message Type The different message types. Routing label The label contained in a signalling message, and used by the relevant user part to jser particulars to which the message refers. A signalling message delivered by the higher levels is transferred over the signalling link in variable length Protocol Data Units PDUs.


Transaction Portion, which contains information elements used by the Transaction sub-layer; a Component Portion, which contains information elements used by the Component sub-layer related to components; and, optionally, the Dialogue Portion, which contains the Application Context and user information, which are not components. Calls that originate and terminate iisup the same switch do not use ISUP signalling.

Views Read Edit View history. All articles with unsourced statements Articles with unsourced statements from August Sub-service field The sub-service field contains the network indicator and two spare bits to discriminate between national and international messages. The following operations are defined: Issup Bearer identification code 12 bits.

Length Specifies the length of the Contents.

It may be one or more octets in length. The tyype bits of the bearer identification code are used where necessary, to identify one among several systems, interconnecting the originating point and destination point.

The format of, and the codes used in tile service information octet are described in It uniquely defines the function and format of each DAP message. Most messages and parameters specified for international use are also required in typical national applications.

When a telephone call is set up from one subscriber to another, several telephone exchanges could be involved, possibly across fil boundaries. The report was from an Alcatel S12 digital switch. This protocol is based on the ISUP protocol, and was adapted to support the ISDN services independent of the bearer technology and signalling message transport technology used.

SS7 ISDN User Part Developer’s Manual (): SS7 ISUP API Description

TCAP Transaction Capabilities Application Part enables the deployment of advanced intelligent network services by supporting non-circuit related information exchange between signalling points using the SCCP connectionless service.

Compliant with ITU Q. Message Type Code The message type code.

Used to usee message signal units which have been received from the remote end of the signalling link. Each message consists of a number of parameters. BIB Backward indicator bit. Service indicator Used to perform message distribution and in some cases to perform message routing.

This page describes the following SS7 protocols:. Cause codes only defined by number are effectively undefined, and may be used for proprietary solutions. The telephone exchanges may be connected via E1 or Fie trunks which transport the speech from the calls. The general format of the header of call and circuit related messages is shown as follows:. The following message type codes are available:.


Mandatory fixed part The parts that are mandatory and of fixed length for a particular message type will be contained in the mandatory fixed part. While these variations of ISUP differ in subtle ways, the vast majority of ISUP message type, parameter type, and parameter field code-points, and related fundamental call processing procedures, agree across all variants.

Different ISUP variants exist. Compliant with ITU recommendation q. The following message types are available: Parameters Each parameter has a name which is coded as a single octet. Message specific parameters Contains specific fields for each message.

This means that one channel is used only for sending the signalling information, whether the system has one bearer channel or multiple bearer channels. OPC The originating point code 14 bits is the code applicable to the data switching exchange from which the message is sent.

This page was last edited on 14 Januaryat By using this site, you agree to the Terms of Use and Privacy Policy. ISUP defines the protocol and procedures used to setup, manage and release trunk circuits that carry voice and data calls over the public switched telephone network. The structure of the MTP-3 header is shown in the following illustration:.

ISDN User Part (ISUP)

FSN Forward sequence number. Existing Message Type Codes are: The data signalling messages are divided into two categories:. The signalling information field of each message signal unit containing an B-ISDN user part message consists of an integral number of octets and tye the following parts: