ISC Reference Architecture – Functional Planesv1.0, Jan 2002

Application/Feature Servers (SCP, Service Logic), Media Server

Service/Application Plane

Call Agents, MGC, Softswitch

Control & Signaling Plane

InterworkingDomain:TG (MG), SG, Interworking GW

Transport Plane

Non-IP Access Domain:Wireline Access (AG, Access Proxies)Mobile Access (RAN AG)Broadband Access (IADs, MTAs)

Subscriber & Service Provisioning, Network Management, Operational Support,Billing Support

Management Plane

Open APIs (Parlay, Jain, CAMEL, SIP, AIN/INAP)

IN/AIN

Signaling (ISUP, MAP, RANAP, MGCP, MEGACO, SIP)

Inter-Network Switch

PSTN/SS7/ATM Networks

Non-IP Terminals/Mobile Networks

SS7; TDM/ATM

SIP/SIP-T; H.323

IP Transport Domain:IP Backbone, Routers, Switches, BGsQoS Mechanisms (RSVP, Diffserv, MPLS …) IP

IP Phones (H.323, SIP, MGCP, …), IP Terminals, IP PBXs

Other VoIPNetworks

ISC Reference Architecture – Functional Entitiesv1.0, Jan 2002

ISC Functional Definitions:AS-F: Application Server Function; SC-F: Service Control Function; CA-F: Call Agent Function;

MGC-F: Media Gateway Controller Function; SPS-F: SIP Proxy Server Function; R-F: (Call) Routing Function;

A-F: Accounting Function (e.g., AAA); MS-F: Media Server Function; SG-F: Signaling Gateway Function;

MG-F: Media Gateway Function; IW-F: Interworking Function; AGS-F: Access Gateway Signaling Function;

AG: Access Gateway; TG: Trunking Gateway

Service & Application

Other IP Network

(SIP, H.323)

Access Network(Wireline/Wireless)

PSTN/INIPSG-F

TG (MG-F)IW-F

(MGC-F)

AGS-FIP Phone (MG-F)(SIP, H.323, …)

MS-F

CA-F/MGC-FSPS-F/R-F/A-FCall Control & Signaling

Transport

Media Signaling

SS7

TDM

AS-F/SC-F

NOTE: Management Function Not Shown for Simplicity

MG-FAG

ISC Reference Architecture – MGC Building Blocksv1.0, Jan 2002

Open Service Access Gateway (a.k.a. 3rd Party Application Gateway)

Application Server

OEM AgentOSS Agent

Access Session Manager & Mobility

(R-F/A-F)

AAA

ENUM

HSS

Interworking/Border Connection Manager

(IWF/Inter-Operator Proxy))

Call Control & Signaling

(CA-F)

Connection Session Manager

(QoS/MGC-F)

TG/MG/AG (MG-F), MS (MS-F)

SG (SG-F),AG (AGS-F)

Proxies

( WAP, CLI…)

Terminal agents, Network agents

ISC Reference Architecture – Physical Examplev1.0, Jan 2002

Access Network(Wireline/Wireless)

SIP or H.323 Network

IN SCP

ExternalSoftSwitch

SS7/BICC Network

ENUM/TRIP

OSS Back Office

NMSSNMP

ENUM/TRIP

MGC/CA

SPS-FCA-F

MGC-F

AS-F

ASe.g., Voicemail Application Server

SIP MS

MS-Fe.g., Media server for digit collection & announcement

SIP/MGCP

SG

SG-F

Sigtran (ISUP, INAP)

SS7/BICC

SIP or H.323

TGMG-F

TDM

PSTN

MGCP/Megaco

SIP/SIP-T

IP Phone

SIP/MGCP/ Megacop

AGAGS-F

Sigtran

RTP/RTCP

IMPORTANT NOTE: the dashed lines represent the realization of information flows achieved by selecting specific protocol and interfaces to meet service requirements; this figure and its associated protocol choices is informative only.

OSS

IW-F

(MAP, IS41)

(IUA, V5UA)

MGCP/Megaco

MG-F

RTP/RTCP

R-F

SIP/MGCP

AccessProxy

RTP/RTCP

A-F

Access Gateway

SIP/SIP-T, H.323, Q.BICC

RTP/

RTCP

Media

Media Gateway Controller/Call Agent

Access Network

Signaling

Media Gateway Controller/Call AgentSignaling

WirelineWireline

WirelessWirelessTrunk Media

Gateway

Media Gateway Control

MGCP

Megaco

Media Gateway Control

MGCP Megaco

PSTN/IN

SS7/BICCSS7/BICC

PSTN/IN SignalingSS7/BICC

ISUP

INAP

TDM/ATMTDM/ATM

IN SCPIN SCP

Sigtran

(M3UA, IUA, V5UA)

IP Phone or Terminal

(H.323, SIP, MGCP, Megaco)

H.323, SIP, MGCP, Megaco

Application Server

Third Party Service

Open APIs

Media

RTP/RTCP

Media Server MGCP, H.248, SIP

MGCP, H.248,

SIP

System Example – Wireline network

Signaling Gateway

Sigtran(M3UA/ SCTP)

IP Network

Examples – POTS Carried over IPv1.0, Jan 2002

Access Gateway

Analog Line

Media Gateway Controller

MGCP/Megaco

Trunking GatewayRTP

PSTN

NOTE: The Access Gateway here is also commonly called:

a. Media Gateway (MG), or

b. Residential Gateway (RG)

IP Network

Signaling Gateway

Examples – Access Network (V5, ISDN) over IPv1.0, Jan 2002

Access Gateway

Analog Line or ISDN BRI/PRI

MGCMGCP/Megaco

Trunking Gateway

RTP

Signaling Gateway

PSTNAN

Media + V5 (V5.2) or ISDN (Q.921) Signaling

Sigtran Signaling:V5UA or IUA

Access Gateway (AG) includes both MG-F and AGS-F

AN: Access Network

BRI: Basic Rate Interface; PRI: Primary Rate Interface

IP Network

Examples – Cable Network (PacketCableTM)v1.0, Jan 2002

DOCSIS Network

IP over HFC

Analog Line

Cable Modem

CMTS

IP Network

CA/MGC

Ethernet

Trunking Gateway

Signaling Gateway

PSTN

NCS or SIP

RTP

NOTE: The Access Gateway here is called:

a. Multimedia Terminal Adaptor (MTA), or

b. Residential Gateway (RG)

AG: MTA

DOCSIS: Data over Cable System Interface Specification

CMTS: Cable Modem Termination System

NCS: Network Control Signaling (modified MGCP for PacketCable)

Examples – VoDSL and IAD over IPv1.0, Jan 2002

DSL Network

IP over ATM

Analog Line

AG: IAD

DSLAM

Packet Network (IP or ATM)

MGC

Ethernet

Trunking Gateway

PSTN

MGCP or Megaco

RTPATU-R

NOTE: The Access Gateway here is called:

Integrated Access Device (IAD)

DSLAM: Digital Subscriber Line Access Multiplexer

ATU-R: Asymmetric Digital Subscriber Line (ADSL) Terminal Unit – Remote

Examples – Wireless (3GPP R99 special case a la NGN)

v1.0, Jan 2002

AG: Media Gateway

E1/T1/ATM: Signaling + Media

MSC Server

Megaco

Media GatewayRTP

PSTN/PLMNRAN

GMSC ServerSigtran Signaling:BSSAP or RANAP over M3UA/SCTP

NOTE: The Access Gateway here is referred to as:

Media Gateway (MG)

RAN: Radio Access Network (GSM or 3G)

MSC: Mobile Switching Center; GMSC: Gateway MSC

Note: MSC Server or GMSC Server is equivalent to MGC

HSS Application Server

PSE

Signaling Gateway

IP Network

Examples – Wireless (3GPP R2000 All IP General Case)

v1.0, Jan 2002

IP:Signaling + Media

MMCS/MMAS

SIP, Megaco

Media GatewayRTP

PSTN/PLMNnon IPRAN

Sigtran Signaling:BSSAP or RANAP

NOTE: The Access Gateway here is referred to as:

Media Gateway (MG) and can be in the terminal (SIP mobiles) or at the Radio Node Controllers

RAN: Radio Access Network (3G)

MMCS: MultiMedia Call Server

MMAS: MultiMedia Application Server

HSS3rd Party Application Server

PSE

MGC

SGSN/GGSN

SIP

Non SIPIP Network

Media & Signaling Gateways

SIP/SIP-T, H.323

Q.BICC

RTP/RTCP

Media

MSC Server

RAN

Signaling

GMSC Server

Signaling Conversion

Sigtran

(M3UA/SCTP)

SS7SS7

BSSAP

RANAP

TDMTDMMedia

Gateway

Media Gateway Control Megaco

Media Gateway Control

Megaco

Signaling Gateway

PSTN/PLMN

Signaling Conversion

Sigtran

(M3UA/SCTP)

SS7/BICCSS7/BICC

PSTN Signaling

SS7/BICC

ISUP

CAP

TDM/ATMTDM/ATM

ATMATM

ATMATM

VLR

Signaling

HLR

MAP Signaling

Sigtran (M3UA/SCTP)

MAP Signaling

Sigtran (M3UA/SCTP)

Application Server

Third Party Service

Open APIsOSA

Open APIs

OSA

Application Server

Third Party Service

Open APIs

OSA

System Example – WCDMA mobile network

IP Network

AcronymsAAA – Authentication, authorization, and accounting (IETF)BSSAP – Base station subsystem application part (GSM, 3GPP)BICC – Bearer independent call control (ITU)CAP – CAMEL application part (GSM, 3GPP)CMTS – Cable modem termination system (DOCSIS, PacketCableTM)ENUM – E.164 number (IETF)HSS – Home subscriber system (3GPP)IAD – Integrated access device (DSL)MAP – Mobile application part (GSM, 3GPP)MEGACO – Media gateway control (IETF/ITU)MGCP – Media gateway control protocol (IETF)MMCS/MMAS – Mobile multimedia call server/Mobile multimedia application server (3GPP)MSC/GMSC – Mobile service center/Gateway MSC (GSM, 3GPP)MTA – Multimedia terminal adaptor (PacketCableTM)NCS – Network call signaling (PacketCableTM)PLMN – Public land mobile network (3GPP, UMTS)PSE – Personal service environment (3GPP)OSA – Open service access (3GPP)RANAP – Radio access network application part (3GPP)SGSN/GGSN – Serving GPRS system node/Gateway GPRS system node (GPRS, 3GPP)SIGTRAN – Signaling transport application network? (IETF)TRIP – Telephony routing interworking protocol (IETF)VLR/HLR – Visitor location register/Home location register (GSM, 3GPP)