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

These messages are transmitted in various stages of call setup and release. Each information element within a TCAP message has the same structure.

Regardless of what facilities are used to interconnect switches, each circuit between two switches is uniquely identified by a circuit identification fike CIC that is included in the ISUP messages.

The Routing Label indicates the Point Codes tupe 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. The remaining bits kser the bearer identification code are used where isn, to identify one among several systems, interconnecting the originating point and destination point.


From Wikipedia, the free encyclopedia. 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. The protocol header structure is as follows: Circuit group reset acknowledgement. The structure of the MTP-3 header is shown in the following illustration:. Mandatory fixed part – Parameters.

Following are the list of cause codes used. The following message type codes are available:. This is also use by the message transfer part to route the message towards its destination point.

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

MAP parameters Various parameters dependent on the operation. By using this site, you agree to the Terms of Use and Privacy Policy.

The service information octet comprises the service indicator and the subservice field. SS7 is a common channel signalling system.

It may be one or more octets in length. Spare bits Not used, should be set to “”.

SS7 ISUP API Description

Tag The Tag distinguishes one information element from another and governs the interpretation of the Contents. Used to acknowledge message signal units which have been received from the remote end of the signalling link. The subscriber interfaces are not covered here and are only listed for a better understanding. It is also used by the Message Transfer Part to route the message towards its destination point.


A TCAP message is structured as a single constructor information element consisting of the following: Similarly Telecom operators trace for Causecodes to debug any call failures. 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: Checksum Every signal unit has 16 check bits for error detection.

Service indicator Used to perform message distribution and in some cases to perform message routing. Compliant with ITU recommendation q. To allow a call to be set up correctly, where ISUP is supported, a switch will signal call-related iisup like called party number to the next switch in the network using ISUP messages.

The format of, and the codes used in the service information octet are described in It transfers messages between the nodes of the signalling network. Click the protocols on the map to see more details.

Isp 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.