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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The signalling information field of each message signal unit containing an B-ISDN user part message consists of an integral number of octets and encompasses the following parts: BIC Bearer identification code 12 bits.

ISDN User Part – Wikipedia

The iup uses this information along with the received signaling information especially the called party number to determine which inbound and outbound circuits should be connected together to provide an end to end speech path.

SS7 is a common channel signalling system. The Circuit Identification Code is used to specify which trunk between two switches is used to carry a particular call.

This page was last edited on 14 Januaryat Message Length The message length in octets. Moreover, coding space has been reserved in order to allow national administrations and recognized operating agencies to introduce network specific signalling messages and parameters fipe the internationally standardized protocol structure.


Transit at intermed exch. Regardless of what facilities are used to interconnect switches, each circuit between two switches is uniquely identified by a circuit identification code CIC that is included in the ISUP messages. It may be one or more octets in length.

Message type code The message type code consists of a one octet field and is mandatory for all messages. There are lot of applications developed isd on the cause code from ISUP signaling. MTP-3 ensures reliable transfer of the signalling messages, even in the case of the failure of the signalling links and signalling transfer points.

This means that one channel is used only for sending the signalling information, whether the system has one bearer channel or multiple bearer channels. A TCAP message is comprised of a transaction portion and a component portion. An information element consists of three fields, which always appear in the following order.

A TCAP message isvn structured as a single constructor information element consisting of the following: This is also use by the message transfer part to route the message towards its destination point. The packet consists of a header followed by up to four information elements.

SS7 Protocol Suite

Pass on not possible ind. The general format of the header of facility registration and cancellation messages is shown as follows:.

Message types may be: Message specific parameters Contains specific fields for each message. The protocol therefore includes the appropriate functions and procedures necessary both to inform the remote parts of the signalling network of the consequences of a fault, and appropriately reconfigure the routing of messages through the signalling network.


Most countries have their own variation of ISUP to cover national requirements.

The signalling information field of each message signal unit contains an ISDN User Part message consisting of an integral number of octets. The telephone exchanges may isrn connected via E1 or T1 trunks which transport the speech from the calls.

Each message consists of a number of parameters.

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

Retrieved from ” https: The name of each parameter and the order in which the pointers are sent is implicit in the message type. Bits contain, in pure binary representation, the channel number of the circuit within the Information Element An information element is first interpreted according to its position within the syntax of the message.

The structure of the MTP-3 header is shown in the following illustration:. The most common messages are: FSN Forward sequence number. Checksum Every signal unit has 16 check bits for error detection.

The general format of the header of call and circuit related messages is shown as follows:. BIB Backward indicator bit. 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.