UNIVERGE SV7000 Solution Description. Version 3

Transcription

1 UNIVERGE SV7000 Solution Description Version 3 GD Page 1 of (67) October 2005

2 Table of Contents 1 Overview UNIVERGE SV7000 System Architecture Hardware Components SV SV7000 Multiple Protocol System (MPS) LAN/WAN Infrastructure Terminals Wireless LAN Software Components SV7000 Software MA4000 Manager and Assistant UM Other Voic Integration Applications Telephony Applications Pure IP Voice Call TDM Voice Call Facsimile Call Telephony System Features Centrex Capability for the Enterprise Environment Toll By-pass Telephony Next Generation Features and Applications Encryption and Security OpenWorX Personal Call Assistant Communications Portal Softphone MA4000 Assistant Unified Messaging Traditional NEC Applications Automatic Call Distributor (ACD) Business Attendant System AIMWorX Call Accounting MTS Call Accounting Maintenance/Infrastructure Cost Reduction Centralized Management LDAP Server Integration User Mobility Infrastructure Cost Reduction Robust Fail-over and Survivability Strategies Core Equipment Redundancy Survivable Remote Media Gateway Controller Basic Fail-over to Analog Power over Ethernet UNIVERGE-enabled Solutions Solutions Overview Enterprise Business Solutions... 6 GD Page 2 of (67) October 2005

3 4.2.1 Customer Features Distributed Office Location Environment Products and Services That Can Improve Customer OPEX End-User Features CENTREX for the Enterprise Solutions Solution Feature Set Benefits to Customers of a Hosted IP Solution Benefits to Operators of a Hosted IP Solution Education Solutions Mobility and Collaboration Classroom & Distance Learning Student Services Fund Raising and Revenue Generation Administrative Productivity Campus Safety & Security Network Management & Security Healthcare Solutions Business Continuity/Core Infrastructure Converged Mobility Multimedia Collaboration Workflow Management Patient Privacy/Network Protection Patient Relationship Management Facility Safety/Security Hospitality Solutions NEC Hospitality Feature Set Converge Architecture Features for the Hospitality Environment Related Documentation... 6 GD Page 3 of (67) October 2005

4 1 Overview NEC Unified Solutions, Inc. introduced the UNIVERGE solution in This solution is based upon an Internet Protocol (IP) architecture and is directed towards customers that want to deliver next generation features as well as the traditional telephony features. This convergence of data and TDM networks results in decreased administration and equipment cost as well as more feature rich communication systems that have all of the benefits traditionally associated with data networks. To date, there are over 190 customers Worldwide using this solution. These customers are located across the globe including: Asia, Australia, North America, and Europe. Customer types range the spectrum from local governments, large international businesses, large enterprise domestic businesses and small to medium size businesses. Key factors influencing the selection of the UNIVERGE IP Telephony System include the following: Carrier-class availability/reliability Open architecture and standards Superior voice quality NEC s strength in voice and data networks for convergence System applications Broad portfolio of customer services The fundamental benefit to NEC customers is that this solution brings true convergence to the marketplace. Customers can seamlessly integrate the UNIVERGE solution with their existing networks, particularly NEC NEAX systems, or use the solution in a standalone environment. In either case, this solution brings state of the art engineering together to provide a next generation solution that can satisfy all market segments (i.e. the new datacom world as well as the traditional TDM world). 2 UNIVERGE SV7000 System Architecture The main focus for the UNIVERGE solution is to provide an architecture that has been built ground up to support a converged network as opposed to IP-enabled architectures or vendors that have simply strung boxes together to form a solution rather than creating a completely integrated architecture. One of the most salient features of the UNIVERGE solution is that it is an open, standards-based solution that was developed after an intense investigation by NEC as to what our customers needed (and wanted) in a next generation product. The investigation determined that customers needed and wanted a product with the following attributes: A single managed infrastructure Distributed switching Converged desktop applications A true solution that seamlessly integrated all components Products that reduce operational costs and at the same time deliver new-age features Products that deliver the same traditional features and applications of TDM networks (thereby ensuring no loss of features and functionality from the current marketplace) GD Page 4 of (67) October 2005

5 These goals have been achieved with UNIVERGE. The UNIVERGE SV7000 solution is composed of the following products: IP Telephony Products SV7000 SV7000 MPS WLAN products (WL-2000) CX switches IX routers Applications Desktop Productivity Unified Messaging/Communications Services Network Monitoring, Network Performance, Security Assessments, etc. Terminals A customer can mix and match these components to achieve the right solution. This is different from other vendors who talk about solutions, then encourage customers to buy a pre-canned solution that may have too many unnecessary features, or not enough. UNIVERGE delivers the correct feature set. The following sections detail the UNIVERGE hardware and software components. 2.1 Hardware Components The UNIVERGE architecture is based upon various software and hardware components. There are only three mandatory components for the UNIVERGE SV7000 solution. The main component is the SV7000, which provides the intelligence for call processing as well as the core feature set. The two other components include: LAN/WAN infrastructure and terminals through which a user can place/receive communications. This section describes the mandatory and optional hardware components required to implement the complete UNIVERGE solution SV7000 The SV7000 is the core component of the telephony solution. The UNIVERGE SV7000 solution cannot be implemented without this product. All other products are optional for a UNIVERGE SV7000 network. However, if an IP network does not currently exist, IP switches, routers, etc are also required to create the data network. The SV7000 product enables IP and SIP (Session Initiated Protocol) telephone calls and features to be passed across an IP network. The product can support various IETF interconnection protocols as well as PSTN interconnection using ISDN PRI and analog trunks. Figures 1 and 2 show the two core components of the SV7000 product. These components are the SV7000T (the telephony server) and the SV7000S (the signaling server). These two components create a media gateway controller (MGC) for the UNIVERGE solution. The product currently supports a maximum configuration of 6,000 ports in one system but through the use of the Fusion Call Control Signaling (FCCS) protocol multiple systems can be connected together to achieve up to 192,000 ports in a system that has the look and fell of a single system. GD Page 5 of (67) October 2005

6 Figure 1: UNIVERGE SV7000T Telephony Server Figure 2: UNIVERGE SV7000S Signaling Server An extensive list of features and capabilities for the SV7000 product are provided in Reference SV7000 Multiple Protocol System (MPS) The SV7000 Multiple Protocol System (MPS) is a smaller version of the SV7000. It has a maximum capacity of 1,000 ports of which a maximum of 500 can be IP clients. The other 500 ports are for conferencing, PSTN trunks, and analog stations. The MPS10 controller card combines both functions of the SV7000T and the SV7000S onto one card. Figure 3 shows an MPS10 along with an interface card in the new MPS 2-slot chassis. Figure 3: UNIVERGE SV7000 MPS The MPS product is very similar to the current SV7000. The following list provides a summary of the basic attributes: Operating system for the MPS server is Linux-based The MPS server unit (MGC) includes both T and S server functionality on one card Total of 1,000 ports (includes terminals, VS-32, MG, etc.) Maximum of 500 IP client ports Maximum of 500 non-ip client ports (trunks, analog stations, VS-32, etc.) Supports G.711, G.729, and G.723a codecs 600 MHz Celeron microprocessor MPS module uses flash card type memory of 512 MB No port interface rack required GD Page 6 of (67) October 2005

7 One of the unique aspects of the SV7000 MPS product is that it can be used as a stand-alone system (using the MPS 10 control card) or the chassis and interface cards can be used as media gateways for a standard SV7000 system. This allows the components to serve multiple purposes, depending upon how a customer wishes to deploy the product. More information can be found in Reference LAN/WAN Infrastructure In most cases, all existing Local Area Network/Wide Area Network (LAN/WAN) infrastructure components are already installed on the network. Therefore, these components are not unique to UNIVERGE. However, NEC also offers a wide range of routers and switches with QoS features that will satisfy the necessary requirements for the UNIVERGE SV7000 architecture. A QoS-capable Layer 2 IP switch is a mandatory requirement for the UNIVERGE architecture. While any standards-based Layer 2 Ethernet switch that supports VLAN tagging and the QoS features can be used, NEC makes the BlueFire & UNIVERGE CX series of products (the BlueFire 200/24 or BF 210/24) that can also support the functions needed for the UNIVERGE SV7000 application. Figure 4 shows an example of an NEC BF210/24 IP switch. Figure 4: UNIVERGE BF210/24 Layer 2 IP Switch Although any industry accepted Power over Ethernet (PoE) switch can perform the tasks needed for this solution, the BlueFire or UNIVERGE CX platform of switches have optimized features that can enhance the Voice over IP (VoIP) experience. This product connects the IP terminal devices to the LAN while providing the required QoS measures for high quality voice. Other NEC components include a Layer 3 QoS capable router, such as the UNIVERGE IX3010. A Layer 2 or 3 IP router is required for the UNIVERGE SV7000 application, especially if extended across the WAN. Figure 5 illustrates the NEC UNIVERGE IX3010 Layer 3 IP router product. GD Page 7 of (67) October 2005

8 Figure 5: UNIVERGE IX3010 Layer 3 IP Router Terminals Whether hardware or software based (as in the SP30 Softphone), the UNIVERGE solution accommodates all forms of terminals including IP phones, SIP phones, wireless LAN handsets, PDAs and computers. Some examples of NEC terminals are shown below. The Dterm IP (ITR series) and INASET both use the Protims VoIP protocol to enable telephony features in a UNIVERGE solution. Figure 6 shows an example of a Dterm IP phone. These terminals support 802.3af PoE, multiple codecs (G.711, G.729a, and G.723.1), 3 lines of LCD display, softkeys, internal switch for local connectivity for a workstation into the phone and various other features. Figure 6: NEC ITR-16D-3 IP Phone The INASET terminal, featuring a large LCD display, is shown in Figures 7 and 8. Figure 7 shows an INASET 240G while Figure 8 shows the INASET 320C. GD Page 8 of (67) October 2005

9 The INASET 240G and 320C terminals have a USB expansion port that connects a keyboard and mouse directly to the terminal (which is unique to the industry). The keyboard and mouse can be used to control various application information such as the following Personal Call Assistant product functions: Corporate Directory Personal Directory Inbound Call History Outbound Call History Location Status Message Reader The INASET 240G enables the use of XML for various features. Four available softkeys can be programmed to access services from an OpenWorX and/or other XML application server. The 3-5/8" display is a 4-scale grayscale LCD that provides features such as date and time, calling party identification and digit-dialed information. Figure 7: NEC INASET 240G IP Phone The INASET 320C and 320G phones can use HTML or Java protocol to deliver applications to these terminals. The INASET 320C has a 256-color LCD while the 320G has a 4-color grayscale. The 320 series has the same features as the 240 series plus it also supports 32 programmable line and feature keys, a full duplex speakerphone, date and time, calling party identification and digit-dialed information. In addition, the 320 series has a larger 5-1/8" display, as well as a USB connection for use with a mouse. GD Page 9 of (67) October 2005

10 Figure 8: NEC INASET 320C IP Phone NEC has introduced a terminal with programmable (designation-less) push buttons. The customer can program the terminal as they need to support various features: call forwarding, speed dial, etc. See Figure 9 for an illustration of this product. Figure 9: NEC Desi-less IP Phone GD Page 10 of (67) October 2005

11 The 16-button Dterm IP Add-on Module makes it possible to display information using programmable keys and to dial from the telephone directory. The Add-on module can be connected to a Dterm Series i, Dterm 16LD, Dterm IP or INASET terminal. It is not available for any of the Dterm IP 4D or Dterm IP 32D products. When connecting the add-on module to a TDM terminal, an interface card is needed in the Port Interface Rack. See Figure 10 for an illustration of the product. Figure 10: NEC Desi-less Add-on Module for IP Phones The Add-on module has the following attributes: USB Interface In Directory mode, users can register telephone data from PC through USB Interface (USB Specification: 1.1) LCD (Liquid Crystal Display) Provides SPD name, feature name and telephone data according to the mode. Each LCD has 8-character capability. 16 Degrees of LCD contrast are available Programmable/Flexible Line/One-Touch Speed Dial key 16 additional keys are provided Contrast/Scroll Key [DSS mode] Contrast Up/Down [Directory mode] Scroll Up/Down. In Directory mode, this key scrolls one by one when 16 entries are displayed. When 4 entries are displayed then page up/down is used. DIR/Exit key Press key to switch DSS mode to Directory mode Press to cancel the procedure during Directory mode GD Page 11 of (67) October 2005

12 NEC has developed a SIP-based terminal capable of using the SIP protocol to deliver most of the Dterm based features that customers are used to. The terminal supports the SIP protocol with NEC extensions to the SIP protocol. See Figure 11 for an illustration of the product. Figure 11: NEC ITN SIP Phone NEC provides a broad range of terminals products including analog, TDM, IP and SIP phones that are not discussed within this product description. Each of those terminals has different feature sets and price points depending upon customer needs. Please see the NEC website product pages and Reference 2 for details on these components Wireless LAN NEC s Wireless LAN (WLAN) technology offers high system capacity, proven system reliability, high voice quality, network integration, future investment protection and extensive user mobility. NEC s WLAN product series has been integrated into the UNIVERGE architecture to provide customer requested features. The UNIVERGE WL series delivers WLAN capabilities to any UNIVERGE network and is based upon the IEEE standard. NEC produces a variety of WLAN products including the WL 2012 (12-port chassis), the WL 2024 (a 24-port version), and the WL 3036 (36-port version). The WL series product allows peer-to-peer calling between SV7000 devices and SIP based terminals deployed via WLAN. Figure 12 illustrates a WLAN network. GD Page 12 of (67) October 2005

13 SV7000 UNIVERGE WL Series Dterm accommodated In SV7000 VoWLAN terminal MH210 Figure 12: Generic WLAN Series Deployment The WL series consists of three main components (in addition to the SV7000): the WL controller, the WL access point and the WL terminal. The terminal and access points communicate via air interface while the access points communicate with the controller via CAT5 cabling. The controller then plugs into the LAN/WAN to access the SV7000. The UNIVERGE WL 2000 Series Wireless Controller has the following features: Enables peer-to-peer IP calls Provides wireless and wire line capabilities RF management capabilities: load balancing via dynamic, real-time channel and power control Enterprise class multi-layer security Wire line capabilities: Wire speed Ethernet switching, PoE, etc. Figure 13 shows the controller component of the WL 2000 series product. Figure 13: UNIVERGE Wireless LAN Controller The UNIVERGE WL 1200 Access Point has the following features: Access Points are directly connected to 10/100 interfaces on the product a/b/g compliant Omni-directional and directional antennas Plenum rated Air monitoring + traffic forwarding in same device GD Page 13 of (67) October 2005

14 Figure 14 shows the access point component of the WL 2000 series product. Figure 14: UNIVERGE WL Access Point The WL 2000 product currently supports three different terminals: the MH110, MH120, and the MH210. More terminals will be released in the near future. The UNIVERGE MH110 handset has the following attributes: b compliant Dterm IP feature set The UNIVERGE MH120 handset has similar features to the MH110 but also supports: Push-to-Talk multicasting Hardened for industrial settings Figure 15 and Figure 16 show two of the WL 2000 series terminal components. The MH210 is a mobile SIP terminal that is designed specifically for the UNIVERGE SV7000 solution. A unique selling point for the MH120 terminal is its support for the push-to-talk and twoway radio feature set. The terminal can support up to 8 different talk groups. This allows end users to be segmented into highly focused groups. One example would be a hotel application. One talk group can be set up for the maintenance group, a second group for the front desk staff, a third group for the housekeeping staff, a fourth group for the concierge and so forth through the push-to-talk group capacity. GD Page 14 of (67) October 2005

15 Figure 15: MH210 Terminal Figure 16: MH120 Terminal All SMDR output for the WL product is created by the SV7000 components of the solution. AIMWorX or MTS can then be used to post-process the SMDR for call accounting purposes. 2.2 Software Components The UNIVERGE SV7000 architecture is based upon various software and hardware components. The SV7000 software and the MA4000 Management System are the only two mandatory software components for the solution. The MA4000 system allows a customer to completely manage the SV7000 product. This section describes the mandatory and optional software components required to implement the complete UNIVERGE solution SV7000 Software The SV7000 software will come pre-loaded on the SV7000T and SV7000S servers. Basic programming will be needed for IP addresses, MAC addresses of peripherals, etc. The basic initialization of the system is created by the MA4000 Installation Manager software. See reference 1 and 3 for more information on programming the SV7000 product MA4000 Manager and Assistant The MA4000 Management System is a web-based management system built upon the Microsoft.NET architecture. The MA stands for Management and Administration. It includes a manager interface for adds, moves, changes, deletes and other administrative functions. An optional assistant interface is available for individual users desktop interface. It includes a separate web application called System Desktop Manager that provides additional feature programming. GD Page 15 of (67) October 2005

16 This product can provide a single point of entry for various NEC products including: SV7000, SV7000 MPS, NEAX 2000 IPS, NEAX 2400 IPX, and voice mail platforms (in MA4000 Release 4.0). Figure 17 shows the various components that the MA4000 will touch in a UNIVERGE network. Figure 17: MA4000 System Management GD Page 16 of (67) October 2005

17 MA4000 primary features: IT friendly, web-based client side interface Alarm notification via or screen pop LDAP auto-provisioning service to support Microsoft Active Directory services for import/export of user data Support for import of customer data from files, especially Microsoft Excel CSV files LDAP, SQL or Windows authentication Flexible access levels (roles) Application program interface (API & SDK) High levels of security including HTTPS support Audit trail logging capability provides extensive logs of changed information Customizable portals Command line interface Integration to the NEC OpenWorX suite of applications NEC s Centralized Authentication Service (CAS) System health monitoring Culture setting allows customers to change the system language; various languages are supported by the product Extensive granularity of templates can be used to create new users Schedulable range programming The software runs on a standard Windows-based server. Further information on this product can be found in References 1 and UM4730 Part of the UNIVERGE solution, the UM4730 integrates with the SV7000 to reduce maintenance challenges. The UM4730 voice/unified messaging system is designed to take full advantage of the SV7000 s IP integration. Up to 32 concurrent voic ports can be supported. The UM4730 has the following core features: 100% IP Integrated Unified Messaging System Operating System: Linux-based Web-based System Administration Console Port count: can range from 2 32 ports of simultaneous voice conversations Seat count: will support up 1,250 Unified Messaging seats per system Hours of Storage: approx. 3,600 (on a 1 GB hard drive) Mailboxes: up to 65,000 Key features of the UM4730 include a browser-based system administration console, Windows-based client desktop mailbox management software and a customized IP integration to the SV7000 system. This integration provides accurate message taking, reliable message lamp control and message delivery over a single Ethernet connection. Administrators can manage the UM4730 from any Windows-based PC through the Microsoft Internet Explorer browser application. GD Page 17 of (67) October 2005

18 The UM4730 System integrates three primary areas of continuous business information: Voice Messaging Integration Call Management For voice messaging, the UM4730 enables subscribers to manage inbound and outbound calls and messages on screen from any networked PC. Messages are managed with a few mouse clicks. The intuitive interface allows users to Play, Send, Reply, Redirect, Archive and Delete messages instantly as well as Rewind, Pause and Fast-forward during playback. Multimedia equipped PCs can even play and record messages without using the telephone. The UM4730 integrated feature gives users 24-hour, two-way access to their Microsoft Exchange or Novell GroupWise messages without the need for a laptop or modem connection. With the Reader module, users can listen to an message using text-to-speech conversion. They can even listen to attachments to the messages. With the UM4730 s advanced call control feature, users can view, answer, place outbound calls, place calls on hold, transfer, conference and screen calls easily and efficiently from their PC. Call Management also allows users to manage multiple calls at the same time and identifies callers before picking up the telephone, enhancing productivity by allowing users to prioritize their calls. Additionally, with Call Log and Contact Lists, important call data is available immediately. The desktop Mailbox Manager on client machines allows end users to modify their own mailbox greetings, security codes, notifications, groups, conversation preferences and other settings. NEC s UM4730 offers Dterm IP Integration with the SV7000 system. This integration is accomplished through IP Dterm telephone set emulation. A single Ethernet connection can support up to 32 simultaneous VoIP sessions. The MA4000 Installation Manager is used to assist with the installation of the UM4730. Further configuration will be achieved through the MA4000 Release 4.0. Standard UM4730 system features include the following: Alpha and Numeric directory Call Holding (busy station) Call Screening Caller Interviewing Date and Time Stamp Fax Detect, Routing & Notification Field Programmable System Key General Audio Error Notification Guest Mailboxes Holiday Schedule Immediate Reply Mailbox Manager manage mailbox options from your PC GD Page 18 of (67) October 2005

19 Menu after Message Menu Interface 1 for YES, 2 for NO Interface Menu-mode Option Message Archive Message Cancellation and Re-Direction Message Delivery to any Telephone Message Editing Message Receipt Verification Message Rewind, Pause & Fast-Forward Message Waiting Notification Multilingual Capability Multiple Personalized Greetings (Standard, Alternate & Busy) Numeric Access On Line Reports Personal Secretary Port Independence Remote Maintenance Single-Digit Dialing Special Delivery Options: Urgent, Private, Future & Return Receipt Speed Keys Subscriber Controlled: Groups, Message Delivery, Call Screening, Call Holding and Directory Listing Subscriber Self-enrollment System Administration via Console or Phone TeLANophy Client Applications 25 Seats Transfer to Attendant User-changeable Voice Prompts Variable-length Passwords Variable-length Security Codes Voice Detect Volume and Speed Control Web-browser Administration Console GD Page 19 of (67) October 2005

20 Optional system features include the following: TeLANophy Desktop Message and Call Control Applications ViewMail ViewMail for Microsoft Messaging ViewCall Plus Integration Microsoft Exchange (5.5 and 2000) Novell GroupWise 5.5 and 6.0 Text-To-Speech Reader ActiveNet Networking AMIS and/or PlusNet Hospitality & PMS Integration Multiple Languages (16 available) Remote Administration Other Voic Integration The SV7000 also offers integration capabilities through its Message Center Interface (MCI) through a LAN connection. The IP data link between the SV7000 and the Voice Messaging system allows the two systems to share information about each call such as Message Waiting Lamp status, Call Forwarding, etc. 3 Applications The core concept behind the UNIVERGE solution is the ability to integrate traditional applications and new-age applications into one converged solution. These applications are the value-add for any IP Telephony solution. There is no need to replace a TDM solution if a customer does not understand the power of IP-based applications. Applications can provide the following: Basic customer and end-user features such as call forwarding, Caller-ID, etc. New age customer and end-user features such as presence, collaboration, PCbased phones, etc. Capabilities to reduce labor or infrastructure costs Capabilities to improve efficiency The ability to create better performing networks The ability to offer new revenue generating products and services The following sections provide details on the key applications that this solution can provide. Section 4 will combine the various applications to show various example solution capabilities of the UNIVERGE platform. 3.1 Telephony Applications The most fundamental part of a converged platform is the ability to make voice and facsimile calls. The SV7000 product is paramount to this application. The SV7000 provides call set-up, tear down, call accounting and voice quality monitoring to ensure successful voice call applications. GD Page 20 of (67) October 2005

21 3.1.1 Pure IP Voice Call The UNIVERGE architecture supports the ability for pure IP phone calls using either an NEC proprietary protocol (Protims) or by using the SIP protocol for call set-up and tear down. The architecture supports both SIP phones and NEC Dterm IP phones. Both types of phones will use peer-to-peer calling, thereby reducing the processing load on the Media Gateway Controller (SV7000). Peer-to-peer is a method in which IP terminals or other VoIP devices communicate directly with each other. The only call stream directed to the media gateway controller is the control signal and on/off hook connection messages from the IP terminals. During an IP peer-to-peer connection, the SV7000 only has to monitor the call for changes in status (call control such as transfer, hold, termination of calls and call setup) thus freeing the processor for the management of other calls. Since voice is not switched within the SV7000, dedicated station cards are no longer required thereby reducing the amount of hardware required to run the same number of stations as compared to a TDM deployment. IP device management is controlled by the licenses installed in the SV7000. Other hardware is needed only when an IP peer-to-peer device must communicate with a TDM device or a TDM trunk. Advantages of pure IP voice calls in a UNIVERGE SV7000 solution: No extra hardware is needed other than the terminal, LAN server, and licenses in order for a peer-to-peer IP device to talk with another peer-to-peer IP device. Station cards (which are both digital and IP), trunk cards and port interface racks are eliminated from this solution. Media packets communicate directly with each other (between peer-to-peer IP terminals) instead of utilizing the server s resources. This is a more ideal communication path for the network and resources. The SV7000 is able to deploy a large amount of peer-to-peer IP terminals and peerto-peer IP trunks. The IP solution can be integrated on any of the following NEC TDM based terminals which are currently being offered to the market Dterm Series E with LCD Display Dterm Series i with LCD Display All IP terminals currently deployed are capable of connecting to the SV7000 without the utilization of circuit cards Softphone technology: Dterm SP30 Dterm Series IP INASET terminals ITN (SIP + NEC extensions) terminals Remote offices can be served cost effectively using an IP network for intra-company voice calls as well as back-hauling TDM calls (using Least Cost Routing) that could result in long distance cost reduction. GD Page 21 of (67) October 2005