ISDN User Part

ISUP
The ISDN (Integrated Services Digital Network) User Part or ISUP is part of Signaling System No. 7 (SS7), which is used to set up telephone calls in the public switched telephone network (PSTN).wikipedia
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Telephone call

callphone callphone calls
The ISDN (Integrated Services Digital Network) User Part or ISUP is part of Signaling System No. 7 (SS7), which is used to set up telephone calls in the public switched telephone network (PSTN).
Most telephone calls through the PSTN are set up using ISUP signalling messages or one of its variants between telephone exchanges to establish the end to end connection.

Signalling System No. 7

SS7SS7 NetworkCCS7
The ISDN (Integrated Services Digital Network) User Part or ISUP is part of Signaling System No. 7 (SS7), which is used to set up telephone calls in the public switched telephone network (PSTN).
The Telephone User Part (TUP) was adopted in Europe and the Integrated Services Digital Network (ISDN) User Part (ISUP) adapted for public switched telephone network (PSTN) calls was adopted in North America.

Public switched telephone network

PSTNtelephone networkpublic telephone network
The ISDN (Integrated Services Digital Network) User Part or ISUP is part of Signaling System No. 7 (SS7), which is used to set up telephone calls in the public switched telephone network (PSTN).
The call is switched using a call set up protocol (usually ISUP) between the telephone exchanges under an overall routing strategy.

Message Transfer Part

MTPMTP 2MTP layer 3
ISUP messages can be sent using the services of the Message Transfer Part, or, less often, the Signalling Connection Control Part.
Some examples of parts at Level 4 are SCCP, ISUP, TUP, and, in the UK, IUP.

Integrated Services Digital Network

ISDN ISDNISDN30
Integrated Services Digital Network (ISDN)
ISDN User Part (ISUP)

Release

released
Release (ISUP), a code to identify and debug events in ISUP signaling

Trio AB

While Trio was built during SS7/ISUP, it has been adapting to use VoIP in its newer products.

Roaming

roaminternational roamingnational roaming
2) Based on the information contained in the MSISDN (national destination code and the country code), the call is routed to the mobile network gateway MSC (GMSC). It's done with an ISUP IAM message.

International gateway exchange

international gateway
International variants of signalling protocols, such as International ISUP and #5, in addition to the relevant national signalling protocols.

Bearer-Independent Call Control

BICC
BICC signaling messages are nearly identical to those in ISDN User Part (ISUP); the main difference being that the narrowband circuit identification code (CIC) has been modified.

M3UA

MTP level 3 User Adaptation'' protocol (M3UA)
M3UA enables the SS7 protocol's User Parts (e.g. ISUP, SCCP and TUP) to run over IP instead of telephony equipment like ISDN and PSTN.

Business telephone system

PBXprivate branch exchangekey telephone system
For the option to call from IP network to the circuit-switched PSTN (SS7/ISUP), the hosted solutions include interconnecting media gateways.

Signal Transfer Point

Signal Transfer Point (STP)signalling transfer pointsSTP
A typical application would be for two SEPs to agree on the use of a shared data path (e.g., using ISUP to initiate a voice call between a user on one SEP and a user on the second SEP).

HP OpenCall

It is most commonly described as a suite of software and hardware applications which allow implementation of common telecom operator services such as voicemail, sms (short message service), prepaid, billing, hlr, etc. It implements industry standard telecom protocols and standards such as SS7, ISUP, TCAP, SIP, MRCP, RTSP, and VoiceXML.

Aculab

Prosody X variants can also be used with Aculab's protocol stacks to connect to SS7 networks for ISUP, signalling monitoring, and non-call related TCAP signalling applications.

IP Multimedia Subsystem

IMSHSSIP Multimedia Subsystem (IMS)
For signalling, CS networks use ISDN User Part (ISUP) (or BICC) over Message Transfer Part (MTP), while IMS uses SIP over IP. For media, CS networks use Pulse-code modulation (PCM), while IMS uses Real-time Transport Protocol (RTP).

Session Initiation Protocol

SIPSession Initiation Protocol (SIP)SIP Trunking
SIP-I, or the Session Initiation Protocol with encapsulated ISUP, is a protocol used to create, modify, and terminate communication sessions based on ISUP using SIP and IP networks.

ISUP

ISDN User Part or ISUP, a feature of Public Switched Telephone Networks

OCN

Originally called number, in telephony, the phone number of the originally called party, regardless of call redirection; look inside a Signalling System No. 7 (SS7) ISDN User Part (IUP) initial address message (IAM) for this optional parameter

Enhanced 9-1-1

E911enhanced 911Wireless Enhanced 911
Some of the upgraded PSAPs can receive calls on ISUP trunks controlled by the SS7 protocol.

Signaling gateway

signalling gatewayGoogle VoiceSignaling Gateways
Protocol conversion gateways can also convert from one network operational paradigm to another – for example, SIP to ISUP for call control, SIP to TCAP for address translation, or SIP to MAP for location or presence.