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BEA WEBLOGIC COMMUNICATIONS PLATFORM™ - WLSS Overview Michael Chang – BEA Systems Inc. Global Account Architect, Technical Manager firstname.lastname@example.org 908-692-5286 12/03/05
©2005 BEA Systems, Inc. | 2 AGENDA Corporate Overview BEA WebLogic Communications Platform BEA WebLogic Network Gatekeeper BEA WebLogic SIP Server BEA WebLogic Communications Platform and IMS Application Use Cases Summary Appendix
©2005 BEA Systems, Inc. | 3 BEA CORPORATE OVERVIEW Leading Application Infrastructure Company One of ten largest software companies in the world Over 16,500 blue-chip customers worldwide Majority of Fortune Global 500 companies rely on BEA Demonstrated Strength and Stability $1B in Sales, >$1.7B in cash 22 consecutive quarters of positive cash flow Global presence 81 offices in 34 countries Over 3,000 employees Strategic Industry Influence More than 2100 systems integrators, independent software vendors, and application service providers Driving innovation into standards—J2EE, XML, Web Services, SIP
©2005 BEA Systems, Inc. | 4 NEXT-GEN SERVICE DELIVERY PLATFORM INTEGRATED SESSION CONTROL CONVERGED APPLICATIONS NETWORK AGNOSTIC Next-Generation Service Delivery Platform Evolution to an all-IP network Well-defined, standardized interfaces through 3GPP, OMA and IETF Based on SIP as standard communication protocol Common abstracted network service interfaces Wireline Wireless IP IP TelephonyPresence Messaging
©2005 BEA Systems, Inc. | 5 Interaction Mgmt WebLogic Portal WebLogic Integration Workshop Framework Application Server Liquid Data WEBLOGIC PLATFORM 8.1 Business Analysts Application Developers Enterprise Developers Third Party Workshop IDE Customers Employees Suppliers Trading Partners Adapter Intelligent Portal Admin Portal Services BPMB2Bi Data Transform Connectivity: JMS/Web Services OA&M High Availability Clustering & Caching Presentation Services Security Manager J2EE Container Data Visibility
©2005 BEA Systems, Inc. | 6 AGENDA Corporate Overview BEA WebLogic Communications Platform BEA WebLogic Network Gatekeeper BEA WebLogic SIP Server BEA WebLogic Communications Platform and IMS Application Use Cases Summary Appendix
©2005 BEA Systems, Inc. | 7 BEA IN COMMUNICATIONS 50 of the top 50 global service providers use BEA Tuxedo or BEA WebLogic to run their operations and services BEA is, by far, the predominant application server vendor to telecom service providers (over 50%) The majority of billing, provisioning, customer care, and Inventory management application providers operate within the BEA environment The majority of leading network equipment providers utilise BEA solutions in their product suites and/or network deployments
©2005 BEA Systems, Inc. | 8 BEA WEBLOGIC COMMUNICATIONS PLATFORM (WLCP) OVERVIEW BEA WebLogic Communications Platform BEA WebLogic SIP Server BEA WebLogic Network Gatekeeper BEA WebLogic Workshop IP TelephonyPresence Messaging Wireline Wireless IP OSS/BSS Billing QoS
©2005 BEA Systems, Inc. | 9 BEA WEBLOGIC COMMUNICATIONS PLATFORM NETWORK ARCHITECTURE SERVICE DELIVERY LAYER APP LAYER NETWORK LAYER SCPSSPMSC Circuit-Switched Network SIP Redirect SIP Registrar Packet-Switched Network Parlay/OSA Parlay A/S Parlay GW IMS CSCF MRF HSS BEA WebLogic Communication Platform BEA WebLogic SIP Server BEA WebLogic Network Gatekeeper OTA WSDL SOAP CORBA SIP B2BUA SIP Proxy
©2005 BEA Systems, Inc. | 10 BEA WEBLOGIC COMMUNICATIONS PLATFORM DETAILS Key Industry Standards SIP-IMS Telecom Web Services Unique Product Suite Combination of SIP application server with powerful network policy enforcement engine Powers New Services Realize higher ARPU with new service innovations Real-time, rich-media, interactive services Securely open network access to 3 rd parties and developers Delivering Next-Generation Services Service Creation Environment OSS/BSS BEA WebLogic SIP Server SIP Servlet Container EJBHTTP SIP SIP Stack SIPRTP BEA WebLogic Network Gate- keeper Telecom Web Services WSDL Policy Engine SOAP Network Plug-Ins
©2005 BEA Systems, Inc. | 11 WHY BEA WEBLOGIC COMMUNICATIONS PLATFORM Only carrier-grade service delivery platform that combines Telecom Web Services, Network Access Management, and IMS Application Platform Telecom Web Services Extend telecom capabilities to IT/Web developers 1 Network Access Management Secure and scalable open network to 3 rd parties 2 IMS Application Platform Foundation for next-gen, converged applications 3
©2005 BEA Systems, Inc. | 12 AGENDA Corporate Overview BEA WebLogic Communications Platform BEA WebLogic Network Gatekeeper BEA WebLogic SIP Server BEA WebLogic Communications Platform and IMS Application Use Cases Summary Appendix
©2005 BEA Systems, Inc. | 13 BEA WEBLOGIC NETWORK GATEKEEPER OVERVIEW MessagingCall ControlMobility ACCESS CONTROL LAYER SERVICE PROVIDERS & APPLICATIONS NETWORK ELEMENTS Parlay/OSA GWMMSC SMSC BEA WebLogic Network Gatekeeper Network Adapters Telecom Web Services Policy Engine Access Control OA&M Partner Management Billing Developer Tools
©2005 BEA Systems, Inc. | 14 BEA WEBLOGIC NETWORK GATEKEEPER (WLNG) What It Is Java/Telecom Web Services-based platform to control & manage enterprise/carrier network quality Policy enforcement engine controlling access to operator’s network from 3 rd party apps What It Does Telecom-enable business applications Guarantee customer/partner Quality- of-Service (QoS) with Service Level Agreements (SLA) enforcement Increase network quality by controlling network access, usage and traffic Network traffic routing and throttling Enhance Partner/Customer Satisfaction with Network Service Quality and Security BEA WebLogic Network Gatekeeper Network Adapters Policy Engine Access Control OA&MPartner Management Billing Telecom Web Services
©2005 BEA Systems, Inc. | 15 TELECOM WEB SERVICES – PARLAY X Now all developers – not just telecom experts – can easily build carrier-grade telecom applications using BEA WebLogic Network Gatekeeper Standards-based, High-Level Interfaces Parlay X Web Services from The Parlay Group 1 Access to Core Network Capabilities Messaging, Call Control, Location, Charging 2 Leverage Off-the-Shelf Developer Tools BEA WebLogic Workshop 3
©2005 BEA Systems, Inc. | 16 AGENDA Corporate Overview BEA WebLogic Communications Platform BEA WebLogic Network Gatekeeper BEA WebLogic SIP Server BEA WebLogic Communications Platform and IMS Application Use Cases Summary Appendix
©2005 BEA Systems, Inc. | 17 BEA WEBLOGIC SIP SERVER SERVICE DELIVERY LAYER SERVICE PROVIDERS & APPLICATIONS NETWORK ELEMENTS SIP User AgentSIP Proxy SIP Redirect Real-time Voice/Video Messaging Voice/Video Over IP Voice/Video Real-time Collaboration Push-to-Talk- over-Cellular SIP B2BUA BEA WebLogic SIP Server SIP SIP Servlet Container HTTP Servlet Container BEA WebLogic Server HTTP
©2005 BEA Systems, Inc. | 18 What is SIP Session Initiation Protocol (SIP) Not a VoIP protocol, but a Multi-Media over IP (MMoIP) technology A text-based, application layer protocol for creating, modifying, and terminating multimedia communication sessions over the Internet SIP is an Internet standard (not telco), defined by IETF (Internet Engineering Task Force) RFC 3261 Leverages other Internet standards: Session Description Protocol (SDP), Real-time Transport Protocol (RTP) SIP networks consist of 4 types of logical SIP network servers: Proxy, Redirect, Registrar, User Agents SIP Proxy SIP Redirect SIP Registrar SIP Network Servers SIP User Agent
©2005 BEA Systems, Inc. | 19 SIP Services Realtime Multi-Media over IP (MMoIP) Services SIP is more than just VoIP. The real value is real-time, interactive multimedia services over IP. Interactive file sharing Multimedia messaging Multimedia instant messaging Multimedia conferencing Realtime video sharing Push-to-Talk over Cellular (PoC) Multimedia services over IP Interactive multimedia gaming Multiparty groups and communities
©2005 BEA Systems, Inc. | 20 Why Session Initiation Protocol For Operators Gain competitive advantages from new converged IT-telecom services Standards-based open interface for multi-vendor service interoperability & integration Leverage a wider IT developer pool New business models with new service types Reduces costs of creating and launching new services For End Users Enriched peer-to-peer communications and collaboration Real-time, interactive multimedia experiences More productive and effective communications
©2005 BEA Systems, Inc. | 21 SIP Network Server Components SESSION CONTROL LAYER APPLICATION & SERVICE LAYER SIP CLIENTS SIP A/S SIP User Agent The endpoint entity that initiate and terminate SIP requests and responses User Agent Clients initiate SIP requests User Agent Servers receive requests and send responses for users Softphones, IM clients, IP phones SIP Proxy Server Routes SIP request/response messages to appropriate User Agent Client and Server Stateful and stateless proxies SIP Redirect Server Maps target user’s SIP address to one or more new addresses and sends to UAC SIP Registrar Server Maintains SIP user location and contact info database for UACs SIP Gateway Connects UAs to non-SIP networks, e.g. PSTN, wireless SIP Proxy SIP Redirect SIP Registrar SIP Network Servers SIP Gateway SIP User Agent User Agent
©2005 BEA Systems, Inc. | 22 BEA WEBLOGIC SIP SERVER (WLSS) What It Is Application server for SIP (Session Initiation Protocol) applications Built on BEA WebLogic Server SIP is an Internet standard (IETF) What It Does Turns internet into “Live” communications and collaboration application Converges IT with multimedia telephony technologies Enables simultaneous voice, video, web, content, images, games, instant messaging, conferencing services Why BEA Proven telecom industry success: Top 50 global carriers using BEA Industry-leading, carrier-grade J2EE platform Proven Servlet product & technology leadership Transform existing applications into real-time (“live”), peer- to-peer, multiparty, multimedia end-user experiences BEA WebLogic SIP Server SIP SIP Servlet Container HTTP Servlet Container BEA WebLogic Server HTTP
©2005 BEA Systems, Inc. | 23 SIP Servlet Container WLSS PRODUCT ARCHITECTURE Admin Console SIP Servlet SSL ListenThread ExecuteQueue SIP TCP Handler SIP UDP Handler SIP Context HTTP Servlet Container HTTP Servlet SIP Request Dispatcher HTTP Context SIP Subsystem MBean HTTP Subsystem MBean HTTPSIP
©2005 BEA Systems, Inc. | 24 Converged J2EE-SIP Application Server Develop, deploy, and manage co-located SIP/HTTP servlet applications Ease development of converged SIP-HTTP Servlet applications HTTP events trigger SIP requests and vice versa SIP applications have native interface to J2EE services without the need to use RMI or SOAP SIP and HTTP Servlet Containers are managed as a single entity Enhanced scalability, security, performance and manageability
©2005 BEA Systems, Inc. | 25 SIP Application vs. Network Servers SIP Network Servers Network element provided by network equipment providers (NEP) Perform SIP session management Not designed to be deployment and execution platforms for SIP application logic Main use case is SIP proxy SIP Application Servers Application element provided by ISVs Designed to host complex, converged application logic which rely on SIP network servers for session control Main use case is Back-to-Back User Agents (B2BUA) doing 3 rd Party Call Control (3PCC)
©2005 BEA Systems, Inc. | 26 WLSS IN SIP NETWORK 10: Media (RTP) Registrar Server User Agent User Agent Redirect Server Proxy Server 4: INVITE 7: OK 8: OK 6: OK 2: INVITE Caller A Caller B 3: Contact B 9: ACK Registrar Server 11: BYE 1: INVITE 5: INVITE
©2005 BEA Systems, Inc. | 27 WLSS IN SIP NETWORK 18: Media (RTP) Registrar Server User Agent Redirect Server Proxy Server 6: INVITE 7: Trying 2: Trying 9: Ringing 3: INVITE Caller A Caller B 4: Contact B Registrar Server 1: INVITE 8: INVITE 5: ACK REGISTER 15: ACK 16: ACK 17: ACK * Record-Route enabled proxies 12: OK 10: Ringing 13: OK 11: Ringing 14: OK 19: BYE 20: BYE 21: BYE 23: OK 24: OK 22: OK User Agent
©2005 BEA Systems, Inc. | 28 SESSION INITIATION PROTOCOL (SIP) Session Initiation Protocol (SIP) Originated in mid-90s from Columbia University by co-author of Real- time Transport Protocol (RTP) and Real Time Streaming Protocol (RTSP), to define a standard for Multiparty Multimedia Session Control (MMUSIC) Developed, and standardized by the SIP Working Group of Internet Engineering Task Force (IETF), published initially as RFC 2543 IETF is the primary standards body for most Internet protocols, such as HTTP (RFC 2616), RTP, etc. Application-level signaling protocol for initiating, modifying and terminating multimedia communication sessions over IP networks SIP messags use text-based encoding like HTTP Session Description Protocol (SDP) – describes media capabilities and characteristics of SIP devices Real-time Transport Protocol (RTP) – used for real-time multimedia data transport over UDP/IP Resource Reservation Setup Protocol (RSVP) – used to establish voice quality of service SIP Network Entities SIP protocol specifies 4 types of logical SIP network entities: User Agent, Proxy Server, Redirect Server, Registrar Server 3GPP IP Multimedia Subsystem (IMS) 3GPP has chosen SIP as the standard signaling protocol for establishing multimedia communications sessions in 3G, all-IP networks based on UMTS
©2005 BEA Systems, Inc. | 29 SIP SERVLETS (JSR-116) SIP Servlet API Standardized thru JCP as JSR-116 (spec lead: Cisco/dynamicsoft) Specifies execution environment for network-based SIP applications Implemented on SIP-enabled J2EE app servers Builds on J2EE HTTP Servlet APIs Enables Servlets to do SIP signaling, either as a User Agent or Proxy Specifies “converged” SIP-HTTP Servlet containers Declarative and programmatic security SIP Protocol Support RFC 3261 – SIP protocol RFC 3265 – Event Notification RFC 3428 – SIP MESSAGE Method
©2005 BEA Systems, Inc. | 30 What’s New in WLSS 2.1 Enhanced High Availability Clustering support Separation of WLSS Data Tier vs. WLSS Engine Tier New Security Features IETF RFC 3325: P-Asserted-Identity SIP header support Adds support for Client-Cert authentication Adds support for JDBC Digest Identity Assertion provider Enhanced Configuration Flexibility Changes to configuring load balancers, network configurations, access logging, and data tier Enhanced Performance Industry-leading SIP message processing and call set-up latency Additional RFCs
©2005 BEA Systems, Inc. | 31 WLSS SIP Servlet Container Overview JSR-116 SIP Servlet API SIP protocol stack Implements key RFCs SIP transaction management SIP session management SIP servlet lifecycle management Shared container startup/shutdown with WLS HTTP servlet container Concurrent execution of SIP and HTTP applications Links HTTP/SIP servlet contexts Management via WLS Admin Console JMX/MBean-based JAAS-based security via WLS SIP/HTTP apps can share same user ID and password
©2005 BEA Systems, Inc. | 32 AGENDA Corporate Overview BEA WebLogic Communications Platform BEA WebLogic Network Gatekeeper BEA WebLogic SIP Server BEA WebLogic Communications Platform and IMS Application Use Cases Summary Appendix
©2005 BEA Systems, Inc. | 33 WLCP & IP MULTIMEDIA SUBSYSTEM (IMS) Communications service providers can create and deploy next-generation IMS applications using BEA WebLogic Communications Platform Host IMS Applications & Services BEA WebLogic SIP Server 1 Policy-based IMS Network Access Control BEA WebLogic Network Gatekeeper 2 Embrace IT and Web Services Developers Telecom Web Services and SIP Servlets 3
©2005 BEA Systems, Inc. | 34 IMS: CONVERGED, NEXT-GEN NETWORK ARCHITECTURE INTEGRATED SESSION CONTROL CONVERGED APPLICATIONS NETWORK AGNOSTIC IMS IP Multimedia Subsystem Telecom Web Services SIP Applications Parlay/OSA Applications Evolution to an all-IP network Well-defined, standardized interfaces through 3GPP, OMA and IETF Based on SIP as standard communication protocol Common abstracted network service interfaces Wireline Wireless IP
©2005 BEA Systems, Inc. | 35 IP MULTIMEDIA SUBSYSTEM (IMS) S-CSCFHSSP-CSCFI-CSCFMRF International standard, defined by 3GPP (Release 5, 6) Cooperation with 3GPP2, OMA, IETF, ETSI, TISPAN Standardized on SIP Horizontal architecture Multimedia network infrastructure Combine services from fixed, mobile, broadband networks Combine multiple media sessions (voice, video, music, pictures, text, data) Wireline WirelessIP SIP A/S Parlay GWIM SSF Core Network
©2005 BEA Systems, Inc. | 36 AGENDA Corporate Overview BEA WebLogic Communications Platform BEA WebLogic Network Gatekeeper BEA WebLogic SIP Server BEA WebLogic Communications Platform and IMS Application Use Cases Summary Appendix
©2005 BEA Systems, Inc. | 37 IMS: IP Multimedia Subsystem What is IMS Telecom industry standard for next-gen, 3G IP-based network architecture by the 3 rd Generation Partnership Project SIP network architecture for the telecom industry Why IMS Supported by all major telco standards groups: wireless, wireline, cable Levels the playing field across fixed, mobile, broadband, IP service providers Accelerates path to increase revenue and decreased costs Key IMS Players NEPs (Ericsson chairs IMS) ISVs (IT and telecom) SIs (global and regional)
©2005 BEA Systems, Inc. | 38 Application Use Cases CLICK-TO-CALL/DIAL REAL-TIME VIDEO SHARING INSTANT MESSAGING VOICE INSTANT MESSAGING VOICE-VIDEO TELEPHONY VIDEO CONFERENCING MULTI-CHANNEL TELEVOTING AUTO-INITIATED CONFERENCE CALLS RICH-MEDIA ENTERPRISE COLLABORATION INTELLIGENT ROADSIDE ASSISTANCE PUSH-TO-TALK OVER CELLULAR
©2005 BEA Systems, Inc. | 39 AGENDA Corporate Overview BEA WebLogic Communications Platform BEA WebLogic Network Gatekeeper BEA WebLogic SIP Server BEA WebLogic Communications Platform and IMS Application Use Cases Summary Appendix
©2005 BEA Systems, Inc. | 40 Leverage Mature Industry Standards Telecom Web Services, SIP, J2EE. 1 Benefit from Unique WLCP Strengths Combined value of Telecom Web Services, Network Access Management & IMS Application Platform. 2 Launch New Services Now! Use BEA WebLogic SIP Server and BEA WebLogic Network Gatekeeper for next-gen service delivery. 3 SUMMARY Monetize 3 rd Party Providers Now! Use BEA WebLogic Network Gatekeeper to securely, and scalably manage 3 rd party network access. 4
©2005 BEA Systems, Inc. | 41 AGENDA Corporate Overview BEA WebLogic Communications Platform BEA WebLogic Network Gatekeeper BEA WebLogic SIP Server BEA WebLogic Communications Platform and IMS Application Use Cases Summary Appendix
©2005 BEA Systems, Inc. | 42 CLICK-TO-CALL/DIAL Ability to initiate a telephony session from a hyperlink from a Web browser or desktop application Initiate calls from MS Outlook-like contact lists via click from a PC, PDA, mobile device Calls are routed via SIP to other IP communication end-points, or routed from the IP network to circuit-switched network devices via PSTN-IP gateways Enables addition of presence, availability and location data for higher value-add Can be embedded into Instant Messaging and other Web-based portal applications to “call-enable” existing applications Sample use cases: Web-based directory service Call sales/support reps directly from the corporate website Call sales/marketing reps from direct marketing e-mails
©2005 BEA Systems, Inc. | 43 REAL-TIME VIDEO SHARING Peer-to-peer, real-time, multimedia video streaming service. Can be offered over full packet-switched networks, or as “combo” service, combining both circuit and packet switched networks. “Combinational” use case – Send video/pictures over packet network during a circuit-switched phone call. Enriches the end-user experience by exchanging pictures, video clips, or live video streams during a phone call. Operators can leverage PSTN infrastructure, investments, telephony performance, user familiarity, and expertise. Video content is delivered, and consumed, in near real-time, with marginal latency. Provides live end-user experiences of “being there” and “sharing the moment”. Spirit of “Live” – Even when sharing stored video clips, “live- ness” is maintained since an on-going voice conversation is maintained.
©2005 BEA Systems, Inc. | 44 INSTANT MESSAGING Allow end-users to send/receive messages instantly Messages can contain any MIME-type media content Text Images Audio/Video Application data SIP and IMS bring instant messaging to mobile devices without interoperability issues Provides store & forward capabilities Presence-based intelligent messaging forwarding Support message delivery to non-SIP devices, such as MMS endpoints
©2005 BEA Systems, Inc. | 45 VOICE INSTANT MESSAGING Form of instant messaging, but instead of sending text, it’s using audio files to send voice messaging. End-users can record voice messages instantly using applications in their phones, or use existing audio files stored on their devices. Like IM, voice messages can be sent to one or more recipients. Use-case scenarios Impulse Messaging – Spontaneous urge to be verbal Fast-n-Easy – Talking is faster and easier than typing in text using a phone/PDA keyboard Individualism – Voice communication is more natural, personal, and individualistic, including singing
©2005 BEA Systems, Inc. | 46 VOICE-VIDEO TELEPHONY Enables users to add video to an existing voice call, depending on the multimedia capabilities of the other party’s communication device SIP enables real-time, peer-to-peer, 1-1, and multiparty voice and video telephony over the IP network SIP-PSTN interoperability allows IP-based voice/video telephony sessions with circuit-switched video communication sessions
©2005 BEA Systems, Inc. | 47 VIDEO CONFERENCING Enables real-time addition of other video call participants into an existing 1-1 video call session Extends point-to-point video calls to multi-point video sessions A video conference bridge links together multiple point-to- point video calls into a single video conference Video telephony connections are established from the end- point terminasl to the video conference bridge
©2005 BEA Systems, Inc. | 48 MULTI-CHANNEL TELEVOTING Extends televoting systems to end-users using different access networks, e.g. fixed, wireless, IP, cable, etc. Allows existing televoting applications to tally votes from multiple voting mechanisms, such as IVR, SMS, WAP, MMS, etc. Voting application can incorporate location-based network data to provide real-time, region-specific, voting results
©2005 BEA Systems, Inc. | 49 AUTO-INITIATED CONFERENCE CALLS Network initiates pre-scheduled conference call, based on the network availability presence data of each core participant for a scheduled conference call, and dials-in each user Application can leverage plug-ins to enterprise calendaring systems (MS Outlook), and Parlay X Web Services network interfaces Removes the end-user inconvenience of having to navigate through conference call announcement menus, and remembering meeting passwords Encourages increased usage of auto-conferencing services Provides Network Operators a branding opportunity on end-user desktops and devices
©2005 BEA Systems, Inc. | 50 RICH-MEDIA ENTERPRISE COLLABORATION Add voice, video, presence, location capabilities to existing enterprise collaboration applications and portals Extends existing MS Outlook/Lotus Workplace-like enterprise collaboration applications with real-time “live”, voice-video-web-email-file sharing-IM-presence capabilities Extends B2E-B2B-B2E, intranet/extranet/partnernet portals with new real-time, collaboration features enabling new business processes and dynamics
©2005 BEA Systems, Inc. | 51 INTELLIGENT ROADSIDE ASSISTANCE Enables end-users in emergency situations to dynamically find & communicate directly with the nearest, available Auto Service Provider End-users interface into an Auto Service Finder application using voice/click/dial-initiated Emergency Assistance number Leverages Parlay X-based Telecom Web Services User Location Web Service - Determines end-user proximity to nearest Auto Service Provider User Status Web Service – Determines availability of end-user and nearest Auto Service Vehicle Call Routing Web Service – Establishes call between end-user with nearest, available Auto Service Vehicle operator
©2005 BEA Systems, Inc. | 52 PUSH-TO-TALK OVER CELLULAR Provides direct 1-1/1-many voice communication services over 2.5G/3G cellular networks e.g. GPRS/EDGE, 1xRTT, 1xEvDO Brings two-way communications to regular cellular phones Enables end-users to communicate 1-1, or 1-many Extremely short call set-up times (no need to dial; just push) Enables new business opportunities using real-time, always-on, “walkie-talkie” voice communications Efficient usage of cellular access and radio network resources Network resources used only for one-way during talk spurt Not use two-way network resources for entire call session Leverage existing 2.5G/3G cellular networks Enable faster service rollout Doesn’t require separate network infrastructure investments Provide natural growth path to WCDMA
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