Page 71 - eBOOK FUNDAMENTAL OF TELECOMMUNICATION NETWORK

Above the network layer in SS7 are defined as

customized signaling protocols that are designed for

specific types of services (e.g telephony, ISDN, mobile

networks, etc.)

ISDN User Part (ISUP)

Used for ISDN subscriber line.

ISDN User Part (ISUP) supports basic telephone call
connect/disconnect between end offices.

Used primarily in North America, ISUP was derived
from TUP, but supports ISDN and intelligent

networking functions.
ISUP also links the cellular and PCS network to the

PSTN.

Telephone User Part (TUP)

Telephone User Part (TUP) is an analog protocol

that performs basic telephone call connect and

disconnect.

Transaction Capabilities Application Part

(TCAP)

TCAP messages are used for applications in SS7.

This protocol is used for communication between

SCP nodes through STP nodes.

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