Session Border Control The ATIS Perspective

Transcription

1 / ATIS Wrkshp Next Generatin Technlgy and Standardizatin Sessin Brder Cntrl The ATIS Perspective Thmas Helmes PMTS - Verizn

2 Overview & Definitins (1) In the cntext f Sessin/Brder Cntrl, we make tw critical classes f distinctins: 1. Sessin/Brder Cntrl vs. Sessin/Brder Cntrller 2. Carrier VIP Peering Needs vs Carrier s Internal S/BC Functinal Architecture Needs / ATIS Wrkshp Next Generatin Technlgy and

3 Overview & Definitins (2) 1. Sessin/Brder Cntrl: Sessin Brder Cntrl - The activities & actins f a cllectin f netwrk signaling & bearer/media functins deplyed within a VIP carrier s netwrk which assist in interfacing with ther carriers and/r end users by prviding security, call prcessing & traffic management capabilities, e.g.: Firewalls, NATs, call admissin, plicing, etc. 2. Sessin/Brder Cntrller: Specific vendr implementatins (netwrk elements) cnsisting f varius subsets & supersets f the Sessin Brder Cntrl functins / ATIS Wrkshp Next Generatin Technlgy and

4 Overview & Definitins (3) 1. Carrier VIP Peering: In the cntext f Peering, the nly relevant aspects f a carrier s S/BC deplyment are thse functins/actins visible t the peer carrier acrss the interface. 2. Carrier s Internal Functinal Architecture: The specific mechanisms, placements & physical packaging f the varius S/BC functins within a carrier s netwrk are slely an issue internal t that carrier. Hwever, we agree there is value in establishing cre requirements n S/BC functins in rder t: 1. Facilitate netwrk element interperability, and 2. Ensure that these functins act in the same way, regardless f where/hw they are implemented in the varius prviders netwrks. / ATIS Wrkshp Next Generatin Technlgy and

5 ATIS VIP Peering Reference Mdel (Nte that this reference mdel is nt cncerned with the internal details f the prviders netwrks, r the manner in which S/BC functinality is internally implemented and distributed) VIP NNI IP Phne CRFE (future) CRFE Wireless Prvider A CCFE VIP BFE CCFE BFE Prvider B VIP Wireless IP Phne SS7 MG MG PSTN CCFE: Call Cntrl FE BFE: Bearer FE CRFE: Call Ruting FE SS7 PSTN Bearer (RTP/IP) Signal (SIP) / ATIS Wrkshp Next Generatin Technlgy and

6 IMS Architecture 3GPP (Nte that S/BCs are nt explicitly identified (at least nt yet) Applicatin Service Layer AS Sh,Si Dh Signaling and Cntrl Layer Other IP Netwrks BGCF Mi Mm Mj ISC S-CSCF Mr MRFC Cx HSS Cx I-CSCF Mg MGCF Dx Dx SGW F SLF Gq PDF Gq P-CSCF Bearer Transprt Layer Mp MRFP Mn IMS-MGW Gm Custmer Premises Equipment UE / ATIS Wrkshp Next Generatin Technlgy and

7 Current ATIS Functinal Architecture and Interfaces (Nte that S/BC functinal entities are explicitly identified) UE IMS Cre functins SIP H.248 DIAMETER Other Gm MRB If P-CSCF Access SBC A-BGF SCIM ISC S-CSCF Mr AS Cx Dh Mi Mg MRFC Mp MS MRFP Sh SLF Dx Rr/R HSS Cx I-CSCF Mi BGCF Mj MGCF T-MGF MGW Rf/R PSTN GW Charging Functin /Mk/Mm SGF SGW PSTN/ISDN PSTN IWF Ib IBCF SEG I-BGF Ia Ic Inter- Id cnnect SBC Other IP Netwrks / ATIS Wrkshp Next Generatin Technlgy and

8 Discussin ATIS Viewpint: 1. S/BC is nt a functinal entity itself. 2. S/BC is really just a cperating set f functins r functinalities distributed amngst ne r mre alreadyidentified FEs (e.g., P-CSCF). 3. A useful apprach is t cnsider S/BC as a functinal grup spanning a number f already-existing FEs. (A functinal grup des nt necessarily map t a single physical entity.) 4. Wrking Dcument PTSC-SAC cntains the ATIS Baseline text fr the currently-agreed S/BC functins. It is essential t adpt a cnsistent view acrss SDOs as t terminlgy and the prper level f granularity t utilize in discussing S/BCs. / ATIS Wrkshp Next Generatin Technlgy and

9 Summary Distinguishing between Sessin/Brder Cntrl and Sessin/Brder Cntrllers is necessary and useful. The distinctin between carrier peering needs and a carrier s internal netwrk architecture needs must be kept in mind this implies sme differences in treatments in standards reference mdels, etc. The crrect functinal representatin f these scalled S/BCs needs t be reslved cnsistently acrss SDOs, in rder t prgress NGN standardizatin wrk. / ATIS Wrkshp Next Generatin Technlgy and