Some messages are marked with a number which indicates the following:. Signaling Information. Access Delivery Indicator 2. Information sent in the backward direction indicating that a SETUP message was generated at the destination access.
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ISUP Introduction. It includes messages associated with the connection and disconnection of calls. ISUP is the protocol used to support the signaling necessary to provide voice and non-voice services in telephone communications. Advantages of ISUP. These advantages include the following:. This does not mean that the exchange cannot interface with non-SS7 capable devices or exchanges.
They are two separate protocols that function together. ISDN may also be used between exchanges, but that is not the primary intent of the protocol. There is enough flexibility and spare capacity within the protocol to support present application requirements as well as, any foreseeable future requirements.
End User Signaling. The exchange is required to provide connectivity and service to the end users of the service by the exchange. While ISUP is not the protocol used to the end user, it does support the services and functionalities provided to the end user by ISDN and other end user protocols. Primary Rate Interface. Other configurations are possible. The PRI offers subscribers flexible bandwidth, high rates of data transfer, and a very stable platform.
Inter-Exchange Signaling. ISUP is used for the exchange of data between exchanges. Data is passed in messages between exchanges for call processing, maintenance, and circuit management. An understanding of these messages is important as it allows you to know what type of data is being transferred between exchanges at any given moment in time.
However, very few exchanges, if any, support all of them. It is a good idea to be familiar with the various messages even if they are not supported by your exchange. It is possible that one of these unsupported messages may be received at your exchange, and it is important to know how to deal with it. See the ISUP messages and parameters. The host manages ISUP call control and circuit management through the following mechanisms:. DS0 Status Change messages notify the host of service state changes and channel purges.
The Service State Configure message allows the host to bring channels in and out-of-service. Network architecture based on digital transmission, switching, and common channel signaling. See Signaling System Number Seven. Public Switched Telephone Network. Telephone User Part. See Integrated Services Digital Network. Message Transfer Part of the SS7 signaling protocol.
See Message Transfer Part. Call processing layer of the CSP. International Telecommunications Union UN. American National Standards Institute. ANSI administers and coordinates the U. More details on these standards may be viewed at www. See Private Branch Exchange.
Digital communications link - voice, data, and video at a 1. A digital communications link - voice, data, and video at a 2. Setting up, monitoring, and tearing down calls. The condition of a component at a given instant. In PPL files, a State is represented by a circle. See Programmable Protocol Language. A condition that, when met, drives a state machine from one state to another. A condition that drives a Component out of its current state by invoking an associated primitive.
See Information Control Block. Positive acknowledgment to a message.
ISDN User Part
Open HUB. Manual Pages. MTP Level 3. SS7 Stack Manager.
ISDN User Part (ISUP)
When a telephone call is set up from one subscriber to another, several telephone exchanges could be involved, possibly across international boundaries. 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 telephone exchanges may be connected via T1 or E1 trunks which transport the speech from the calls. 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.