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The gateway initiates the call into the PSTN by selecting an SS7 ISUP trunk to the The ISUP address complete message (ACM) is sent back by the PSTN to. This chapter reviews the ISUP and TCAP protocols and their functions within the ISDN User Part (ISUP) defines the protocol and procedures used to set up. Aug 22, SS7 Tutorial. . Figure 8. Basic ISUP Signaling. . The ISDN User Part (ISUP) defines the protocol used to set-up, manage, and release trunk.

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ISUP controls the circuits used to carry either voice or data traffic. In addition, the state of circuits can be verified and managed using ISUP.

The management of the circuit infrastructure can occur both at the individual circuit level and for groups of circuits. Services that can be defined using ISUP include: Switching, Voice mail, Internet offload. ISUP is ideal for applications such as switching and voice mail in which calls are routed between endpoints. When a call is placed to an out-of-switch number, the originating SSP transmits an ISUP initial address message IAM to reserve an idle trunk circuit from the originating switch to the destination switch.


Telecom Tutorials by Samir Amberkar: SS7 (ISUP) – 7

The destination switch rings the called party line if the line is available and transmits an ISUP address complete message ACM to the originating switch to indicate that the remote end of the trunk circuit has been reserved. The STP routes the ACM to the originating switch which rings the calling party’s line and connects it to the trunk to complete the voice circuit from the calling party to the called party.

The STP routes the ANM to the originating switch which verifies that the calling party’s line is connected to the reserved ispu and, if so, initiates billing. If the calling party hangs-up first, the originating switch sends an ISUP release message REL to release the trunk circuit between the switches. If the called party hangs up first, or if the line is busy, the destination switch sends an REL to the originating switch indicating the release cause e. Upon receiving the REL, the destination switch disconnects the trunk from the called party’s line, sets the trunk state to idle, and transmits an ISUP release complete message RLC to the originating switch to acknowledge the release of the remote end of the trunk circuit.


When the originating switch tutofial or generates the RLC, it terminates the billing cycle and isul the trunk state to idle in preparation for the next call.

ISDN User Part (ISUP) | TelecomSpace

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Who’s online There are currently 0 users online. A simple call flow using ISUP signaling is as follows: Log in or register to post comments. Create new account Request new password. Total users on TelecomSpace: Who’s new Amit Singh Tuotrial Josip11 devik abdul gafar.