ISDN User Part - ISUP
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1 ISDN User Part - - ISDN User Part /TUP brief comparison additional features Interworking of signaling systems is an international and national network signaling system for call setup, supervision and release. In addition it supports a wide range of ISDN supplementary services. Rka/ML -k2001 Telecommunication Switching Technology I 13-1 Course scope - lecture scope H.323 or SIP IP SIP or CAS, R2 IP HLR PABX ISDN Switching Fabric MAP Voice path CCS7 AN V5 Control Part INAP SCP Rka/ML -k2001 Telecommunication Switching Technology I 13-2
2 Alfaskopm346 - ISDN User Part milestones TUP was specified before DSS1 ISDN user signaling during 1980 s. 2 specification was released after DSS 1. 2 deployment in Finland started Changeover from TUP to is well under way internationally. In network core development path is CAS -> TUP ->. If TUP is already deployed, changing to is relatively easy by a software upgrade in exchanges, because MTP-infra is already in place. Development under way in : ETSI is adding charging information messages into. IETF (SIGTRAN) is specifying over IP Rka/ML -k2001 Telecommunication Switching Technology I 13-3 Why does the ISDN need instead of TUP? Limitations of TUP compared to : DSS 1 terminal compatibility information can not be transported in TUP, User-to-User information is not specified in TUP signaling messages ISDN Suspend/Resume is not supported in TUP, * * TUP does not support all (Euro-)ISDN supplementary services - call waiting, call hold... In TUP release is non-symmetric / in ISDN it is symmetric Rka/ML -k2001 Telecommunication Switching Technology I 13-4
3 Al faskopm346 Alf askopm346 Alf a sko p m346 Bearer services supported by are speech 64 kbit/s unrestricted (= transparent 64kbit/s) 3.1and7kHzaudio alternate speech / 64 kbit/s unrestricted alternate 64 kbit/s unrestricted / speech 2 x 64 kbit/s unrestricted 384 kbit/s unrestricted 1536 kbit/s unrestricted 1920 kbit/s unrestricted In the future offers extenstions compared competition from the Internet is tough! to TUP, but Rka/ML -k2001 Telecommunication Switching Technology I 13-5 ISDN basic structures ISDN CPE ISDN voice handset ISDN basic access ISDN services ISDN primary access ISDN CPE TA passive bus LE ISDN: bearer services teleservices supplementary s LE 30B+D PBX PC Group 4 fax Interworking with other networks PLMN /GSM PSDN PSTN Rka/ML -k2001 Telecommunication Switching Technology I 13-6
4 Basic structure of an message 4. level 2. level level MTP message F CK SIF SIO LI F I B B FSN I BSN B F the first bit which is sent message 8n bits data 48 route addr. +CIC 4 4 subservice field DCBA service code 0101= 0100=TUP Route address and Circuit Identification Code (CIC) CIC SLS OPC DPC 4bits 12bits 4bits 14 bits 14 bits OPC - Originating Point Code DPC - Destination PC CIC 12bits With TUP, SLS = four lowest bits of CIC NB: message coding style is similar to DSS1, TUP style is different. Rka/ML -k2001 Telecommunication Switching Technology I 13-7 Call identification is based on a compulsory CIC and an optional (logical) call reference Call reference is recommended only for national use. n x 64kbit/s connections are always built using consecutive timeslots, thus one CIC is enough. n x 64kbit/s -connection is identified using the smallest CIC among the time-slots. CIC binds the call channel and signaling together. One can not exist without the other --> one result is that in IN a special standardised Basic Call State Model is needed. The BCSM is used track the state of the resources in an SSP (service switching point) while an SCP (service control point) processes additional features. Binding to CIC is also an issue when Interworking with IP Telephony systems. Rka/ML -k2001 Telecommunication Switching Technology I 13-8
5 A successful call (calling subscriber initiates release ) Calling party Called Party Call Stages set-up EX SAM ACM EX Signaling Messages Initial address message Subsequent address message Address complete message call ringing tone CPG(ALERT) ringing tone Call progress(alert) ANM Answer message speech release MPM REL RLC Charging (Finnish spec) Release message Release complete message Rka/ML -k2001 Telecommunication Switching Technology I 13-9 circuit supervision messages --> circuits and 2M connections can be taken into use and from use in a managed way. RSC Reset circuit BLO Blocking BLA Blocking acknowledgement UBL Unblocking UBA Unblocking acknowledgement EHL End-of-hold (*) EHA End-of-hold acknowledgement (*) OLM Overload (*) UCIC Unequipped circuit identification code (*) X BLO BLA X Can not place calls on cic def in BLO (*) For national use Rka/ML -k2001 Telecommunication Switching Technology I 13-10
6 Forward COMPATIBILITY is ensured from 1992 release A B A XXX XXX MESSAGE COMPATIBILITY INFO - TRANSIT AT INTERMEDIATE EXCHANGE INDICATOR, - RELEASE CALL INDICATOR, - SEND NOTIFICATION INDICATOR (CONF), - DISCARD MESSAGE INDICATOR, - PASS ON NOT POSSIBLE INDICATOR, -... message coding supports software upgrades - old and new version cantalktoeachother! Rka/ML -k2001 Telecommunication Switching Technology I Version compatibility rules: the following should not be changed: Protocol procedures, messages, information elements, coding, except to correct an error in the protocol. Semantics of existing info elements. Formatting and coding rules Adding new parameters into mandatory part of Messages, Optional part can be extended. Order of information items in an Information Element of variable length, new items can be added to the end of the IE. Information item value = all 0 == non-significant value. + Fall-back and other compatibility procedures. Rules apply from 92. Rka/ML -k2001 Telecommunication Switching Technology I 13-12
7 Calling Line Identification Presentation - CLIP - is a supplementary service supported by A = CALLING PARTY NUMBER: - PRESENTATION RESTRICTED IND. - SCREENING INDICATOR - ADDRESS SIGNAL ACCESS TRANSPORT PARAMETER: SUB-ADDRESS GENERIC NUMBER: CALLING PARTY NUMBER (USER) The directory number of the calling subscriber and condition indicators under which the number can be presented can be carried in. Rka/ML -k2001 Telecommunication Switching Technology I Calling Line Identification Presentation Restriction - CLIR - is a pair to CLIP OVERRIDE A = CALLING PARTY NUMBER: - PRESENTATION RESTRICTED IND. - SCREENING INDICATOR - ADDRESS SIGNAL ACCESS TRANSPORT PARAMETER: SUB-ADDRESS GENERIC NUMBER: CALLING PARTY NUMBER (USER) - PRESENTATION RESTRICTED IND. Presentation of A-subscriber s number may be restricted to support privacy. Restriction can be overridden, given appropriate rights by the law. Rka/ML -k2001 Telecommunication Switching Technology I 13-14
8 Connected Line Identification Presentation -COLP - is a mirror image to CLIP B = A B OPTIONAL FORWARD CALL INDICATOR: - CONNECTED LINE IDENTITY REQUEST IND. ACM ANM/CON -CONNECTED NUMBER: PR=00, SI=11 -GENERIC NUMBER: PR=00, SI=00, NQI=101 -ACCESS TRANSPORT PARAM.: SUB-ADDR PR = 00, presentation allowed SI = 11, network provided SI = 00, user provided not verified NQI = 101, additional connected nbr. Gives the identity of BtoA.NB:dueto supplementary services B may be different from dialled nr Rka/ML -k2001 Telecommunication Switching Technology I Connected Line Identification Presentation Restriction - COLR - is the pair to COLP B = OPTIONAL FORWARD CALL INDICATOR: CONNECTED LINE IDENTITY REQUEST IND. ACM ANM/CON OVERRIDE -CONNECTED NUMBER: PR=01, SI=11 -GENERIC NUMBER: PR=01, SI=00, NQI=101 -ACCESS TRANSPORT PARAM.: SUB-ADDR PR = 01, presentation restricted SI = 11, network provided SI = 00, user provided not verified NQI = 101, additional connected nbr. Rka/ML -k2001 Telecommunication Switching Technology I 13-16
9 Alfaskopm346 User to User Signalling 1 - UUS1 - allows transporting user provided information over CCS7 network (UUI) 30B+D ACM(UUI ) ANM(UUI ) REL(UUI ) RLC IMPLICIT SERVICE UUI = USER-TO-USER INFORMATION Rka/ML -k2001 Telecommunication Switching Technology I Terminal Portability (TP) - ISDN allows interrupting a call and resuming it even from a different phone or phone line.. SUS RES CONVERSATION STATE Suspend --> the other end can be synchronized Resume Rka/ML -k2001 Telecommunication Switching Technology I 13-18
10 Call Forwarding No Reply - CFNR - automatically forwards an incoming call to C-number A B C ACM OPT. BACKW. CALL IND: - CALL DIV. MAY OCCUR CPG(*) CPG(ALERT) s ACM ANM ANM (*) CALL DIV. INFO, REDIR. NBR., GENERIC NOTIF. Rka/ML -k2001 Telecommunication Switching Technology I Signaling interworking occurs in an exchange if two legs of the call are managed using different signaling systems Signaling system X Exchange or other Network Element Signaling system Y X Interworking of signalling systems Also we talk about signaling interworking if two peer exchanges are manufactured by different vendors (interworking of different implementations) cmp. compatibility Rka/ML -k2001 Telecommunication Switching Technology I 13-20
11 DSS1 / -interworking Subscriber Setup_ack Setup Exchange Exchange - Initial Address Message Info Call_proceeding Alerting Connect Connect_ack SAM - Subsequent Address Message ACM - Address Complete Message CPG - Call ProGress ANM - ANswer Message Release Conversation or data transfer phase Disconnect REL - Release Message Release_comp RLC - ReLease Complete message Rka/ML -k2001 Telecommunication Switching Technology I Each signaling system has its own set of signals of information elements -> in interworking almost always some info is lost. To ensure smooth interworking, functioning need to be carefully specified. If we have n signaling systems, there are n 2 interworking cases! Standardization bodies use two methods for the specification of interworking: For Channel Associated signaling: event based FITE/BITE -method. For message based signaling: layer oriented method. Rka/ML -k2001 Telecommunication Switching Technology I 13-22
12 Event based interworking specification method FITE - Forward Interworking Telephone Event Between signaling systems. BITE - Backward Interworking Telephone Event SPITE - Switching Processing Interface Telephone Event - internal to an exchange. Logical procedures/incoming signaling Interworking logic Outgoing signaling logical procedures Forward signals FITEs FITEs Backward signals BITEs BITEs Incoming and outgoing signaling systems are analyzed only to the extent necessary for the specification of interworking. Logic is given using SDL. Rka/ML -k2001 Telecommunication Switching Technology I Layer oriented interworking specification Primitives carry the information between layers Call control Indication (1) Response (4) Request (2) Confirm (3) Incoming (outgoing) Signaling System A (e.g. DSS1) Outgoing (incoming-) Signaling System B (e.g. ) Numerot ilmaisevat primitiivien järjestystä Rka/ML -k2001 Telecommunication Switching Technology I 13-24
13 Signaling flow is described in more detail: Exchange Incoming SS Call Control Outgoing SS A Q-ind Q-req B D Q-resp Q-conf C E R-req R-ind G F R-conf R-resp H Time tone Backward thruconnection Bi-directional thruconnection Teardown of thruconnection Forward thruconnection Seizure of incoming/outgoing circuit, etc Because SDL is not used, specs is never complete -> vendors take care of the details. Rka/ML -k2001 Telecommunication Switching Technology I In V5 - PSTN protocol, interworking is specified differently: partially in AN, partially in the exchange PSTN protocol Analogue AN L3 protocol entity V5.x L3 protocol entity LE FEhandling National FEhandling protocol entity National AN -part - autonomous signaling sequences AN takes care of: - timing and duration of analogue signals - charge indication frequencies and voltages - ringing voltage - autonomous functions specified in national specs FE - function element primitives - primitives describe the state of the analogue circuits in AN or in LE describe the interworking with analogue subscriber line signaling RKa/k97/s38.110/luento Rka/ML -k2001 Telecommunication Switching Technology I 13-26
14 Ongoing development of 1. ISDN charging protocol to transport tariff and billing info - The Finnish network has traditionally carried charging messages. In most other countries the originating exchange needs to know all tariffs in the world. - Reflect the difference between monopoly and competitive markets - ETSI is specifying messages between charging points to transport information about additional tariffs on a call by call basis: - Final tariff may be composed of many parts - tariff info is maintained by the party, who wants to earn the money. - Makes easier to apply dynamic tariffs. Rka/ML -k2001 Telecommunication Switching Technology I carries charging info Charging registration and generation point CHG(AoC) CHGA CHG(AoC) CHGA ACM Charging determination point 1 CHG CHGA ACM Charging determination point 2 In charging generation point, info can be processed into a new form, The registration point produces a CDR- call detail record Rka/ML -k2001 Telecommunication Switching Technology I 13-28
15 - more ongoing development 2. -over-ip for IP-telephony networks - e.g. In Finland in pilot use although the specs is not ready - SIGTRAN group in IETF SCTP IP Signaling Control Transport Protocol = transport protocol for e.g. signaling modified from TCP - SCTP/IP replaces MTP + (SCCP) (SCCP =?, may survive.) Rka/ML -k2001 Telecommunication Switching Technology I 13-29
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