Signaling Architecture

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Hubert Moody
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1 ITU-T / ATIS Wrkshp Next Generatin Technlgy and Standardizatin Signaling Architecture Viqar Shaikh Telcrdia ITU-T

2 Scpe Call Cntrl Signaling Architecture Identify Netwrk Elements invlved in call cntrl signaling Functins f these Netwrk Elements ATIS Functinal Architecture and Interfaces Illustrative Call Flws IP riginatin and terminatin IP riginatin and PSTN terminatin ITU-T 2

3 Overall Functinal Architecture and Interfaces UE IMS functins SIP H.248 DIAMETER Other Gm NASS MRB TISPAN functins If Mw P-CSCF Access SBC A-BGF SCIM Mw Gq PDF Mr AS ISC Cx Dh S-CSCF MRFC Mw Mi Mg Mp MRFP Sh SLF RACS Rr/R HSS Cx Dx I-CSCF Mi BGCF Mj MGCF Mn T-MGF MGW Ie Rf/R Charging Functin Mw/Mk/Mm SGF SGW PSTN/ISDN PSTN IWF Ib IBCF SEG Id I-BGF Ia Ic Intercnnect SBC Other IP Netwrks ITU-T 3

4 Descriptin f Signaling Netwrk Elements Applicatin Server (AS) Executes service lgic assciated with value-added services Prvides enhanced and intelligent services t subscribers Call Sessin Cntrl Functin (CSCF) Prxy CSCF (P-CSCF) is the first pint f cntact and the cntrl pint fr the User Equipment (UE) within the Service Prvider netwrk. It frwards sessin requests frm the UE t the S-CSCF Serving CSCF (S-CSCF) has access t the user subscriptin data and actually handles the sessin request Interrgating CSCF (I-CSCF) is the first cntact pint within a Service Prvider netwrk fr all incming sessin requests frm anther Service Prvider Breakut Gateway Cntrl Functin (BGCF) Identifies the netwrk that will be used fr cnnecting IP sessins t the PSTN ITU-T 4

5 Descriptin f Signaling Netwrk Elements (Cntd.) Hme Subscriber Server (HSS) Stres all the static and dynamic infrmatin fr a subscriber Maintains a list f features and services assciated with a user, and als the lcatin and means f access t the user Prvides user prfile infrmatin Subscriptin Lcatr Functin (SLF) Queried during Registratin and Sessin Setup t get the name f the HSS cntaining the required subscriber specific data Media Gateway Cntrl Functin (MGCF) Cntrls the parts f the call state that pertain t cnnectin cntrl fr media channels in a T-MGF MGW Selects the CSCF depending n the ruting number fr incming calls frm legacy netwrks Perfrms prtcl cnversin between ISUP and call cntrl prtcls (e.g., SIP) and maintains call states ITU-T 5

6 Descriptin f Signaling Netwrk Elements (Cntd.) Multimedia Resurce Functin Cntrller (MRFC) Cntrls the media stream resurces in the MRFP under directin frm an S-CSCF r Applicatin Server Interprets infrmatin cming frm an AS r S-CSCF (e.g., sessin identifier) and cntrls MRFP accrdingly Multimedia Resurce Functin Prcessr (MRFP) Prvides media resurces under the directin f MRFC May generate media streams (e.g., multimedia annuncements), mix incming media streams fr multiple parties, r prcess media streams (e.g., audi trans-cding, media analysis) Plicy Decisin Functin (PDF) Prvides management f netwrk QS resurces, authrizatin f resurce allcatins, and makes plicy decisins with regard t use f netwrk QS resurces ITU-T 6

7 Descriptin f Signaling Netwrk Elements (Cntd.) Trunk Media Gateway Functin (T-MGF) Terminates bearer channels frm a switched circuit netwrk and media streams frm a packet netwrk (e.g., RTP streams in an IP netwrk) Establishes and releases cnnectins between these channels under cntrl f the MGCF in supprt f calls between PSTN and IP netwrk Signaling Gateway Functin (SGF) Acts as a gateway between the IP call/sessin cntrl signaling and the SS7-based PSTN signaling May prvide signaling translatin, fr example between SIP and SS7 r simply signaling transprt cnversin e.g., SS7 ver IP t SS7 ver TDM ITU-T 7

8 Descriptin f Signaling Netwrk Elements (Cntd.) Access Brder Gateway Functin (A-BGF) Packet gateway between an access netwrk and a cre netwrk used t mask a service prvider s netwrk frm access netwrks, thrugh which UE accessing packet-based services (e.g., IMS, Internet) Functins may include Opening and clsing gate, Traffic classificatin and marking, Traffic plicing and shaping, Netwrk address and prt translatin, and Usage infrmatin Under cntrl f the PDF Intercnnectin Brder Gateway Functin (I-BGF) Packet gateway used t intercnnect a service prvider s cre netwrk with anther service prvider s cre netwrk supprting the packet-based services Functins may be the same as that f the A-BGF ITU-T 8

9 Descriptin f Signaling Netwrk Elements (Cntd.) Intercnnectin Brder Cntrl Functin (I-BCF) Cntrls I-BGF t interwrk with ther packet-based netwrks May supprt the fllwing functins (nt limited t): Inter-dmain prtcl nrmalizatin and/r repair Inter-dmain prtcl interwrking Interactin with PDF fr resurce reservatin, resurce allcatin, and/r ther resurce related infrmatin Media Resurce Brker (MRB) Assigns specific media server resurces t incming calls at the request f service applicatins (i.e., an AS) Acquires knwledge f media server resurces utilizatin and reservatin requests that it can use t help decide which media server resurces t assign t resurce requests frm applicatins Emplys methds/algrithms t determine media server resurce assignment ITU-T 9

10 ATIS Functinal Architecture and Interfaces UE IMS functins SIP H.248 DIAMETER Other Gm MRB TISPAN functins If Mw P-CSCF Access SBC SCIM Mw ISC S-CSCF Mr AS Cx Dh Mw Mi MRFC MS Mg Sh SLF Dx Rr/R HSS Cx I-CSCF Mi BGCF Mj MGCF PSTN GW Rf/R Charging Functin Mw/Mk/Mm SGF SGW PSTN/ISDN PSTN Ib IWF IBCF SEG Id Ia Ic Intercnnect SBC Other IP Netwrks A-BGF MRFP T-MGF MGW I-BGF ITU-T 10

11 Applicatin Service Cntrl Decmpsitin f Applicatin Layer and Interface t Service Cntrl SCIM APL * MRB HSS S/I-CSCF SLF MS ITU-T 11

12 IP Originatin and IP Terminatin Call Flw SBC SBC UE P-CSCF S/I-CSCF AS INVITE INVITE (Orig. Features) P-CSCF UE INVITE (Tem. Features) INVITE 180 Ringing 200OK ACK RTP ITU-T 12

13 IP Originatin and PSTN Terminatin Call Flw SBC UE P-CSCF S/I-CSCF AS INVITE INVITE (Orig. Features) BGCF MGCF SGF (SGW) PSTN GW T-MGF (MGW) IAM 180 Ringing ACM 200 OK ANM ACK RTP TDM Trunk ITU-T 13

14 Thank Yu ITU-T 14

Emergency Services and Priority Signaling

ITU-T / ATIS Workshop Next Generation Technology and Standardization Emergency Services and Priority Signaling Martin Dolly AT&T (With credit to Percy Tarapore (AT&T) for Priority contributions) ITU-T