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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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This indicates the number of octets following the length indicator octet. The service indicator is used to associate signalling information with a particular User Part and is only used usfr message signal units see Recommendation Q. This is also use by the message transfer part to route the message towards its destination point.

ISDN User Part (ISUP)

For proper operation of the signalling link, the PDU comprises transfer control information in addition to the information content of the signalling message. Compliant with ITU recommendation q. Message specific parameters Contains specific fields for each message. Pass on not possible ind.

TCAP Transaction Capabilities Application Part enables isu; deployment of advanced intelligent network services by supporting non-circuit related information exchange between signalling points using the SCCP connectionless service. The SAAL functions provide a signalling link for reliable transfer of signalling messages between two signalling points.

Calls that originate and terminate at the same switch do not use ISUP signalling. In the case of no outbound circuit being available on a particular exchange, pxrt release message is sent back to the preceding switches in the chain.


DPS The destination point code 14 bits is the code applicable to the data switching exchange to which the message is to be delivered. Spare bits Not used, should be set to “”. Compliant with the ITU specification Q. Parameters Each parameter has a name which is coded as fule single octet. Operation specifier The type of packet. 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.

Message Type Code The message type code consists of a one octet field and is mandatory for all messages. In addition to call related information, ISUP is also used to exchange status information for, and permit management of, the available circuits. Regardless of what facilities are issup to interconnect switches, each circuit between two switches is uniquely identified by a circuit identification code CIC that is included in the ISUP messages. A signalling message delivered by the higher levels is transferred over the signalling link in isdj length Protocol Data Units PDUs.

Compliant with ITU Q. A TCAP message is structured as a single constructor information element consisting of iddn following: An information element consists of three fields, which always appear in the following order. The message type code uniquely defines the function and format of each SCCP message.

Message Type Code The message type code. The format of the BICC packet iaup shown in the following iskp 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.

In national applications when this discrimination is not required possibly for certain national User Parts only, the subservice field can be used independently for different User Parts.


The service information octet comprises the service indicator and the subservice field. The following operations are defined: Existing Message Type Codes are: The iskp exchanges may be connected via E1 or T1 trunks which transport the speech from the calls.

Each message consists of a number of parameters. This is a very basic call flow involving only two telecom switches which exchange the ISUP messages.

Heading code The heading code 4 bits contains the message type code which is mandatory for all messages. Following are the list of cause codes used. The data signalling messages are divided into two categories:.

The format of the header is shown in the following illustration:.

FSN Forward sequence number. Routing label A standard routing label.

SS7 Protocol Suite – BICC | BISUP | DUP | ISUP | MAP | MTP-2 | MTP-3 | Q | SCCP | TCAP | TUP

The Circuit Identification Code tpe used to specify which trunk between two switches is used to carry a particular call. The Tag is composed of Class, Form and Tag codes. Circuit group unblocking acknowledgement. The following message types are available: Even for a normal ISUP call, a isvn code is generated. ITU-T specifies the variant used in the international network.

Retrieved from ” https: To allow a call to be set up correctly, where ISUP is supported, a switch will signal call-related information like called party number to the next switch in the network using ISUP messages. The signalling information field of each message signal unit contains an ISDN User Part message consisting of an integral number of octets.