Call Connection control Signaling : the ITU-T SG11 status and points of view for New Network control Architectures and .


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Call & Connection control Signalling : the ITU-T SG11 status and perspectives for “New Network control Architectures and Protocols”. Alain LE ROUX ITU-T SG11 Vice-chairman email: alainxavier.leroux@rd.francetelecom.com. Presentation Layout . Scope of ITU-T Study Group 11 current activities
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Call & Connection control Signaling : the ITU-T SG11 status and points of view for "New Network control Architectures and Protocols" Alain LE ROUX ITU-T SG11 Vice-director email: alainxavier.leroux@rd.francetelecom.com ITU-T Workshop on IP/Optical

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Presentation Layout Scope of ITU-T Study Group 11 current exercises Overview and status of Signaling Systems/SS7 Overview of Legacy Signaling Systems Bearer (ATM, IP) Independent Call Control: BICC Signaling Enhancements for Convergence to immaculate IP environment: SS7/BICC-SIP interworking Addressing Call, Connection & Resource/Policy control conventions for new system designs (NGNs) From Legacy Signaling to new era flagging Protocols Summary/Concluding comments ITU-T Workshop on IP/Optical

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Scope of ITU-T Study Group 11 activities Define Signaling necessities and conventions for: improvements to existing Recommendations on get to (UNI) and (entomb)- arrange (NNI) flagging conventions for PSTN, ISDN and Packet (ATM and IP)- based systems Some Mobility & Nomadic related capacities (in connection with SSG) the support of voice, information and Multi-media interchanges and administrations rising NGN models, including Internet Protocol (IP) related control capacities Lead Study Group for Intelligent Networks (and developing Services & applications control stages): Architectures, flagging prerequisites, and control Protocols ITU-T Workshop on IP/Optical

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How is ITU-T Study Group 11 organized SG 11 is composed in 4 Working Parties: WP 1 - Intelligent Network (IN) and Services/Applications control WP 2 – Requirements for IP and Advanced system applications WP 3 – Engineering of rising (e.g. BICC) and "legacy" flagging conventions WP 4 – Engineering of ATM AAL2 flagging and normal Signaling (transport) Protocols SG11 Home page at: http://www.itu.int/ITU-T/studygroups/com11/index.html ITU-T Workshop on IP/Optical

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ITU-T SG11 items Develops Recommendations in the Q-arrangement, e.g.: Q.700-arrangement for Signaling System n° 7 (SS7), flagging transport and call/association control conventions in TDM-based systems Q.900-arrangement for ISDN DSS1, get to flagging Q.1200-arrangement, IN design and conventions Q.2100-arrangement, B-ISDN ATM-based systems flagging transport Q.2700-arrangement, B-ISDN ATM-based (between )system (NNI) flagging Q.2900-arrangement, B-ISDN DSS2 (UNI) get to flagging Produces enlightening records, as Supplements to Q-arrangement of Recommendations, e.g.: Q.Supplement n°1 – SS7, Testing and Planning devices Q.Supplement n°3 - Number Portability, Scope and Capability Set 1 design ITU-T Workshop on IP/Optical

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ITU-T SG11 Current work center: Interactions amongst IN and IP-based systems : Question 1/11: Signaling prerequisites for flagging backing for new, esteem included, IP based and IN based administrations Question 4/11: API/protest interface and design for flagging IP-related flagging conventions: Question 6/11: Signaling necessities for flagging backing for administration between working of both dialup Internet get to and Voice, Data and Multimedia Communications over IP-based systems Question 8/11: Signaling necessities for adaptable administration of element transfer speed and QoS requests in association control (e.g. MPLS-ATM) Bearer (ATM, IP) Independent Call Control (i.e. BICC): Question 9/11: Signaling necessities for the support of BICC applications Question 11/11:Protocols for the support of BICC applications Signaling transport over IP: Question 13/11: Common flagging transport conventions, including over IP Question 15/11: ATM AAL2 flagging, interworking with IP ITU-T Workshop on IP/Optical

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Signaling strategies development : Initially "in-band" motioning (in simple systems) : DTMF on simple lines and Multi-Frequency over circuits likewise utilized as a part of X.25 Packet systems (Virtual Circuit control parcels and client information bundles persisted the same legitimate station) Common Channel Signaling (CCS) in advanced systems: Signaling messages continued committed flagging connections (regularly 64 kbs circuits): SS7 (Q.700 arrangement) generally conveyed Integrated Call and Bearer association control: at first intended for 64 kbs circuit exchanged systems, additionally received for ATM (VP, VC) exchanged systems Has empowered the rise of Intelligent Network (IN) administrations from Service Control Points (SCP) isolated from Switching Functions Separated Call and Connection control in Packet-based Networks: The Bearer Independent Call Control convention (BICC) appropriate to control narrowband calls and administrations (normally voice) in ATM and IP-based transport systems ITU-T Workshop on IP/Optical

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IN SCP SCF SS7 INAP SSF CCF SSP PSTN/ISDN Network (NNI) flagging Access (UNI) flagging Overview of legacy Signaling Systems For TDM limit band (PSTN, ISDN) systems Access (UNI) flagging DTMF (PSTN) DSS1 (ISDN BA and PRI) Inter and Intra Network (NNI) flagging SS7 MTP, SCCP (control convention transport), TC SS7 ISUP (call control) SS7 INAP (IN administration control) For ATM systems Access flagging: DSS2, UNI Network flagging: B-ISUP, PNNI, AINI ITU-T Workshop on IP/Optical

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SCP SCF SS7 INAP SS7 INAP SSF CCF Proxy SSP IP PSTN/ISDN SS7 and IN Convergence towards Packet based Networks (1) Inter-working amongst Legacy and IP-based transport systems Application of IN to IP organize administrations INAP over IP (or by means of SGW for SS7 over IP) Must contain (or have entry to) client profile information Statefull method of operation Call Server Media Gateway ITU-T Workshop on IP/Optical

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SS7 Convergence towards Packet based Networks (2) Intelligent Network engineering and conventions upgraded to bolster the IETF PINT & SPIRITS benefits IN Capability Set 4 (CS4) Recommendations affirmed in May 2001, utilizing a most optimized plan of attack endorsement prepare (i.e. AAP) Q.1241 – Introduction to IN CS4 Q.1244 – Distributed Functional Plane for IN CS4 Q.1248.1-7 – Interface Protocols for IN CS4 IN CS4 Recommendations incorporate support for the IETF PINT (PSTN and InterNetworking for Telephony), e.g. Snap to-dial, & SPIRIT ( Services in the PSTN/IN Requesting InTernet) Service s, e.g. Web Call Waiting (i.e. the necessities and structures are in arrangement). ITU-T Workshop on IP/Optical

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SS7 Convergence towards Packet based Networks (3) For Call control flagging, Bearer Independent Call Control (BICC) conventions have been characterized to apply over Packet (ATM or IP) based transport systems BICC Capability Set 1 appropriate to ATM (AAL1 or AAL2) transport: Recommendations have been affirmed in year 2000 BICC CS2 relevant to ATM and IP transport: an arrangement of 15 Recommendations have been endorsed in June 2001. A BICC CS3 discharge with different improvements (counting interworking with SIP) is right now a work in progress. Extension and necessities being finished. Conventions archives endorsement arranged in 2003. ITU-T Workshop on IP/Optical

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BICC flagging convention The abnormal state necessities BICC is a Signaling convention to ease PSTN/ISDN advancement towards (NGN) Next Generation Network (bundle based transport) structures Usable to control brings over any parcel (ATM, IP) - based transport organize Simplifies the flagging interworking between legacy systems and NGN models The arrangement created in ITU-T SG11: The Bearer Independent Call Control (BICC) convention Based on SS7 ISUP: speedier to characterize and to execute, simpler ISUP-BICC between working Multiple Capability Sets (or discharges), empowering staged organization and smooth development towards NGN designs ITU-T Workshop on IP/Optical

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BICC review What is BICC ? a design that gives a method for supporting narrowband (PSTN, ISDN) benefits over a Packet-based spine organize without affecting the current system interfaces and end-to-end benefits a call control convention that is ignorant of the genuine conveyor transport being utilized. Restricting data distinguishes the conveyor utilized for every correspondence example a call control convention that depends on SS7 ISUP flagging convention ordinarily utilized as a part of legacy systems for PSTN/ISDN intra-and between systems administration carrier (association) control flagging conventions rely on upon the fundamental conveyor innovation utilized (e.g., DSS2/UNI for ATM AAL sort 1 and ATM AAL sort 2, IP and additionally MPLS related flagging conventions) ITU-T Workshop on IP/Optical

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BICC application As a call control convention between Call Servers Where it between acts with SS7 ISUP flagging And guarantees NB-systems end-to-end administrations, unaffected Call Server Call Server BICC SS7 ISUP SS7 ISUP PSTN/ISDN PSTN/ISDN ATM, IP spine LE Media Gateway Media Gateway ITU-T Workshop on IP/Optical

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BICC hidden design Functional detachment of Call/administration Functions, Bearer Control Functions and Bearer (Media) Functions. Bundle (ATM, IP) Transport Network Serving Node Serving Node SS7 ISUP Call & Service Functions BICC Call Mediation Node (select.) BICC Call & Service Functions SS7 ISUP Bearer Control Function Bearer Control Function Bearer Signaling Bearer Signaling Bearer Function TDM Trunks Bearer Function TDM Trunks ITU-T Workshop on IP/Optical

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How the ITU BICC approach fits with that in IETF (1/4) BICC is an even minded answer for empower development from legacy systems towards NGN structures (utilizing ATM as well as IP-based transport advances) It between acts effortlessly with legacy flagging conventions (as it is especially in light of SS7 ISUP) But it is not by any means the only competitor convention for call and administration control in rising systems: SIP and SIP-T are likewise under thought for appropriation by the ITU-T, for use between Call Servers (frequently alluded to as Call Agent or "Softswitches") As such, the methodologies are integral ITU-T Workshop on IP/Optical

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How BICC approach fit

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