HP ProCurve Networking IP Telephony Solution

Transcription

1 HP ProCurve Networking IP Telephony Solution Technical Brief Introduction... 2 Business and IT Needs and Benefits... 2 Solution Topology... 2 Figure 1. HP ProCurve IP Telephony Solution Overview... 3 HP ProCurve Switches... 4 Mitel 3300 Integrated Communications Platform (ICP) Controller... 4 Mitel 3300 Network Services Unit (NSU)... 5 Mitel 3300 Analog Services Unit (ASU)... 5 Mitel IP Phones... 5 HP ProCurve Management... 5 Mitel 3300 ICP Management... 5 Solution Overview and Design... 5 Networking Architecture Best Practices... 5 Design and Implementation Process... 6 End-to-End QoS... 7 Solutions Value... 8 Flexibility to Grow with the Customer... 8 Expandability... 8 Resiliency and High Availability... 9 Interoperability... 9 Detailed Configuration Information Figure 2. Bill of Materials IP Telephony Solution Services Summary For More Information... 12

2 Introduction IP telephony is considered the next-generation solution for communications infrastructure. To support an IP telephony solution, the enterprise network must be a multi-service network a network on which voice, video, and data can coexist over a single IP-based infrastructure. For IP telephony, enterprises can choose to continue to use existing telephony equipment and migrate to IP telephony over time at a pace that makes sense for them, with minimal disruption. Alternatively, they may choose to replace the existing telephony equipment with IP telephony products. HP ProCurve IP Telephony solutions help customers get more from their networks by easily adding voice capability to an existing network. This solution combines industry-leading IP switching infrastructure with IP telephony products for true communications convergence. HP ProCurve Networking is committed to the development of products and solutions based on industry standards providing our customers choice and flexibility. Mitel Networks is equally committed to industry standards. HP ProCurve Networking and Mitel Networks have leveraged their 50 years of combined experience in network and IP telephony to deliver proven and tested end-to-end Voice over IP (VoIP) solutions. These solutions support the HP ProCurve Networking Adaptive EDGE Architecture, allowing customers to build secure, mobile, multi-service networks. Business and IT Needs and Benefits A multi-service network that deploys IP telephony gives organizations an affordable way to simplify and streamline their communication systems. Enterprises want to realize the benefits of a converged IP network cost savings, advanced applications, and new ways of collaborating across business objectives. IP telephony provides enterprises with a core platform for business innovations such as: Business communications collaboration unified messaging, virtual call centers and interactive voice response (IVR), which will streamline operations and improve business communications. Business voice features Teleworker productivity In choosing a network strategy, enterprises must ensure that the converged network does not compromise the quality of voice or data traffic. It is important to consider such factors as: Resiliency Cost savings Standards and interoperability Ease of use Voice features Voice quality Scalability End-to-end service and support Solution Topology Figure 1 presents a network topology that links a remote office to the corporate headquarters via a wide area network (WAN), using HP ProCurve Networking equipment in conjunction with a Mitel Networks 3300 Integrated Communications Platform (ICP) at each site. 2

3 The offices are connected via a packet-switched transmission network (PSTN) and analog trunks to ensure against loss of service in the event that the WAN is unavailable. The local PSTN also ensures that local phone service does not need to traverse the WAN link and provides service to analog devices such as fax, modem, and emergency 911 services. In addition, this topology incorporates a legacy third-party PBX at the corporate headquarters, to allow the enterprise a smooth migration to take advantage of IP telephony without forcing an expensive forklift replacement. Figure 1. HP ProCurve IP Telephony Solution Overview Fax Corporate headquarters (400 employees) Mitel ASU Analog trunk PSTN Analog trunk Remote office (50 employees) Mitel ASU Fax Analog phone Mitel NSU ISDN PRI ISDN PRI E1/T1 module Mitel 3300 ICP Analog phone Mitel 3300 ICP Third-party PBX Authentication servers T1 WAN T1 HP 600 RPS/EPS HP ProCurve Switch 2650-PWR HP ProCurve Manager HP ProCurve Routing Switch 9300m series HP 600 RPS/EPS HP ProCurve Switch 5300xl series with 10/100 PoE modules HP 600 RPS/EPS HP ProCurve Switch 5300xl series with 10/100 PoE modules Laptop PC Laptop PC PC PC Clients Legend 10/100Base-T GigE fiber Analog (POTS) TDM (ISDN PRI) Q. SIG PRI 3

4 HP ProCurve Switches HP ProCurve Networking products provide IP connectivity, supporting a variety of traffic prioritization mechanisms using Layer 2 (IEEE 802.1p/Q) and Layer 3 IP type of service (TOS), IP precedence, DiffServ Code Point (DSCP), UDP/TCP Port and/or IP address. HP ProCurve Networking switches can provide power to IP telephone handsets over standard Cat-5 Ethernet cable via the IEEE 802.3af Power over Ethernet (PoE) Standard, with redundant PoE power. HP ProCurve Switch 2600 series HP ProCurve Switch 5300xl series with expandable PoE modules Layer 2 and 3 managed stackable 2650-PWR 48 10/100 PoE ports 2626-PWR 24 10/100 PoE ports Layer 2, 3 and 4 managed chassis 76.8 Gbps non-blocking crossbar switching fabric with up to 48 million pps throughput Up to /100/1000 ports and 6 mini-gbic slots 5304 up to 96 ports (10/100) at 15.4W PoE 5308 up to 192 ports (10/100) at 15.4W PoE HP ProCurve Routing Switch 9300m series Layer 3 and 4+ managed chassis 10/100/1000/10 Gigabit Up to GbE ports, 232 Gigabit, 672 autosensing 10/100 ports or a combination HP ProCurve 600 Redundant and External Power Supply (J8168A) HP ProCurve 610 External Power Supply (J8169A) Not pictured Redundant power to any one of up to six switches Fully redundant PoE power for 2626-PWR for all 24 ports at 15.4W each Redundant PoE power for 2650-PWR for all 48 ports at average 7.6W each Provide redundancy via power ring connection 816 total watts of power PoE power for up to 4 HP ProCurve Switch 5300xl 10/100-TX PoE modules Mitel 3300 Integrated Communications Platform (ICP) Controller The Mitel Networks 3300 ICP is a converged IP-PBX system that uses the IP network for connecting IP telephony devices. Key components include the Mitel 3300 ICP Controller, network services unit (NSU) and analog services unit (ASU). A distributed architecture pushes intelligence and call control to the edge of the network, where it is needed. The Mitel 3300 ICP Controller provides the voice, signaling, central processing and communications resources for the IP telephony system. It also houses an optional integrated voice mail system as well as 4

5 embedded applications such as ACD (automatic call distribution), embedded systems management, or integration into hotel/motel property management systems. A single 3300 ICP supports up to 700 IP users per system. With the ability to cluster multiple systems together, the system supports tens of thousands of users (whether they are co-located or geographically dispersed), but can be managed as a single network from any location. Mitel 3300 Network Services Unit (NSU) The Mitel 3300 NSU provides digital trunks to PSTN over T1 or E1 links to the 3300 ICP, with support for up to two T1 or E1 links per unit. The 3300 NSU also provides Q.SIG or DPNSS (Europe) connectivity to any third-party legacy PBX. Mitel 3300 Analog Services Unit (ASU) The Mitel 3300 ASU provides connectivity for analog trunks and telephones (POTS and On-Premise Stations (ONS)) to the 3300 ICP. The Mitel 3300 ASU supports 16 ONS CLASS (On-Premises Station Custom Local Area Signaling System) and four Loop Start (LS) trunk CLASS ports. The 3300 ASU provides four integral System Fail Transfer (SFT) relays for direct connection between an analog telephone and Loop Start trunk in the event of a system or power failure. It also provides connections for Music on Hold (MOH) and Paging capabilities. Mitel IP Phones Dual-port, multi-line display, IP speakerphone with programmable keys Voice quality of service (QoS) switched 10/100Base-T with VLAN priority tagging (802.1p/Q) Built-in compression with G.711 and G.729 codecs 128-bit AES (Advanced Encryption Standard) HP ProCurve Management HP ProCurve Manager/HP ProCurve Manager Plus, Web Based, CLI, SNMP SNMP Traps for event/alarm notification to third party NMS Mitel 3300 ICP Management OPS Manager a complete management application to control the operation and management of all the Mitel telecommunications equipment. The OPS Manager uses browser-based software. Web-based system management tools (individual user customization and group configuration) Available services include advanced implementation and design, voice over IP (VoIP) LAN assessment, training and various levels of support services. Solution Overview and Design Networking Architecture Best Practices HP ProCurve recommends these best practices when designing network solution: Deploy open-standards based solutions to reduce the likelihood of massive redesign down the road. Provision sufficient bandwidth on WAN links. 5

6 Prioritize voice traffic over data. Consider the adoption of a Service Level Agreement (SLA) with the service provider to specify network availability, throughput and average round-trip delay. Design and Implementation Process Designing an IP telephony network solution includes these steps: 1. Perform an assessment of the current network. Network assessment is a valuable tool to help prepare network for IP telephony. It s essential to determine the ability of a company s network to support voice traffic, so that any obstacles can be remove before deployment for example, insufficient bandwidth or QoS settings. An assessment generates traffic and measures actual jitter and delay values across various segments of the network. The results indicate any significant performance issues that might jeopardize voice quality on the network. A company also needs to know in advance how many voice calls its current network can safely support. In addition, a proper network baseline can assist with subsequent deployment and troubleshooting. 2. Determine the additional bandwidth and performance that will be required for new voice services. If the WAN will carry voice traffic, the bandwidth requirement must be assessed carefully. The link must be provisioned with sufficient bandwidth to simultaneously support the maximum number of desired voice calls and business-critical data applications. Each active telephone call typically requires 100 Kbps of bandwidth for each uncompressed (G.711) and 40 Kbps for each compressed (G.729) telephone conversation. Companies should be sure to understand the network constraints so enough bandwidth is available for worst-case scenarios. 3. Design a network topology including the IP telephony equipment A well-designed IP Telephony network consists of a high-bandwidth, redundant core network and an access network for edge device access. The core should have uninterruptible power supply (UPS) backup and be cross-connected in a redundant configuration, so that the failure of a single device will not result in a total network outage. The access network should provide power via IEEE 802.3af (POE) Standard and use UPS backup to provide for reliable power for E911 service. IP telephony deployments typically use a variety of trunks to provide PSTN connections for local calls, to ensure resiliency in the event of a WAN failure, and to provide a migration path with a legacy PBX to allow staged VoIP deployments. 4. Implement end-to-end QoS, as described in the following section. 5. Deploy telephony equipment and upgrade the network as needed. During deployment, you will install and configure the IP PBX(s) and additional switches as needed; configure the DHCP service for IP phones; configure the dial plan and E911 service; install IP phones; and validate phone features and dial plans. Consider deploying VoIP across the enterprise in phases, so you can validate your strategy before expanding the implementation. 6

7 6. Perform a post-install network assessment to validate your end-to-end solution. As conditions on your network evolve over time, you should continue to test the network periodically to assess the impact of new applications, increases in network usage, and any other changes that might affect voice quality. 7. Implement ongoing engineering End-to-End QoS For a converged IP network to support both voice and data applications, appropriate QoS must be established to ensure that voice quality is protected in the presence of bursty data traffic, and to ensure that business-critical applications do not get starved. Voice Quality Three primary network impairments can affect voice quality: Packet loss the percentage of undelivered packets in the data network. Data packets can request a retransmission, while voice packets are simply discarded, causing gaps in the conversation. For toll-quality voice, HP ProCurve recommends packet loss of less than 1%. Jitter the variability in packet arrival at the destination. Unlike data packets, voice packets must arrive at regular intervals, to avoid a distortion in sound. For toll-quality voice, HP ProCurve recommends jitter of less than 50ms variation in delay of sequentially transmitted packets. One-way delay, or latency the average travel time for a packet to pass through the network from destination to destination. Voice is a delay-sensitive application; as the delay increases, voice quality is impacted. For toll-quality voice, HP ProCurve recommends less than 150ms end-to-end delay. For the WAN link, we recommend a one-way delay of 80ms or less. To deliver toll-quality voice on an end-to-end basis, voice traffic must be prioritized higher than bursty data traffic on every link along the data path between IP telephones. HP ProCurve recommends the use of VLAN topologies to fully isolate voice and data networks and no routing between them. This allows network managers to create end-to-end QoS policies in a heterogeneous multi-vendor deployment of switches, routers and end-hosts. HP ProCurve switches offer a weighted fair queuing (WFQ) mechanism to minimize delay and jitter for real-time applications and guarantee availability of bandwidth to protect against packet loss. This approach allows several traffic types to share the same link and ensure that higher-priority traffic types, like VoIP, get the bandwidth they need when they need it without starving other business critical applications. The use of VLANs also ensures that excessive broadcast and multicast packets present on many data networks will not disrupt IP telephony equipment or affect voice quality. Along with 802.1p/Q priority tagging, VLANs offer a significant security benefit by providing a convenient way of isolating IP telephony equipment from data traffic. 7

8 Because the VLAN tag is not retained when the frame is forwarding over WAN links, a Layer 3 prioritization method is required. HP ProCurve 5300xl series switches resolve this issue by mapping VLAN/802.1p priority values to DSCP or ToS prioritization, to ensure that voice packets receive a higher priority than data traffic. Solutions Value There are numerous benefits to an IP telephony solution such as the one described above. To begin with, a cost-effective standards-based solution reduces the likelihood of expensive massive replacement down the road. By choosing components that are designed for interoperability and based on industry standards, future decisions will be far less costly. The distributed architecture pushes intelligence to the edge of the network where it belongs. This allows the network to effectively support all types of users, while allowing easy management for moves, additions and changes. Also, there are several advantages to assigning a different subnet address to voice and data VLANs: increased security between voice and data traffic; ensuring that all call control and voice traffic gets the appropriate level of priority; and a simpler QoS configuration. In addition to these technology benefits, IP telephony serves as a strategic enabler for business benefits. An IP telephony network greatly reduces the cost of network management and ownership. At the same time, IP telephony fosters business innovation by supporting new applications and communication tools such as unified messaging, intelligent voice recognition, messaging mobility, and contact/relationship management tools all of which can drive new revenue streams. This combination of cost savings and business innovation provides new opportunities for enterprises to realize enhanced revenue. Flexibility to Grow with the Customer Expandability As network needs grow, businesses can continue to add functionality to its IP telephony solution. Options include: Converged applications such as integrated and unified messaging, contact center applications, videoconferencing, and more Scalability the ability to continue adding ports and telephones in a scalable manner E911 emergency support using MAC lockdown protection to prevent unauthorized movement of phones A PC-based real-time communication tool that provides a single, unified interface for call handling, integrated communications and collaboration Plug and work teleworking transparent access to the corporate voice network from any location with broadband Internet access ACD and automatic route selection. 8

9 Resiliency and High Availability The reliability of communication systems is a critical requirement for enterprise business. Enterprises have come to expect percent or five 9s reliability of traditional telephony systems. To ensure that a converged network is highly reliable, these key components should be included in the network design: Backup and redundant power UPS eliminate the impact of power glitches and allows for a graceful system shutdown in the event of an extended outage. HP ProCurve PoE switches use a redundant external power supply (RPS/EPS) that minimizes the impact of a power supply failure, offering an indispensable way to provide dial tone during power outages. Alternate network connectivity Distributed resilient networks offer the ability to route around failed or inaccessible portions of an IP network. Alternate network connectivity can be achieved by using cross-connected or meshed switches in a redundant configuration, coupled with the use of PSTN trunk or analog trunk access between controllers to ensure against loss of service or call features if the WAN is unavailable. No single point of failure The ability to locate resiliency at different locations removes the concern for a total system outage due to a catastrophic event such as water damage or fire. The efficient use of existing hardware in a distributed topology can significantly reduce hardware costs. Many redundancy solutions require dedicated expensive hardware for every controller to solve temporary and often infrequent system failures. The inclusion of an alternate ICP in the network topology provides for call control resiliency. The alternate ICP provides services to phones in the event of a failure in the home ICP or in the event of a networking failure between the phone and the ICP. Any calls in process are maintained, and embedded voice mail continues to be provided. Once the failure is corrected, the alternate ICP directs phones back to the home ICP. An IP telephony solution built upon the HP ProCurve Networking Adaptive EDGE Architecture and the Mitel 3300 ICP provides for resiliency throughout the network, eliminating the risk of a single point of failure. Interoperability The HP ProCurve Networking solution offers broad support for open standards that promote interoperability with VoIP products. Open standards allow companies to install VoIP in selected locations while maintaining their existing investment in PBX equipment. For example, the Mitel 3300 ICP integrates with any third-party PBX. It provides an incremental migration path to VoIP while preserving existing investments, with support for existing analog equipment such as fax machines, modems, conference room speakerphones and emergency 911 phones. 9

10 Detailed Configuration Information Figure 2 presents a bill of materials for a sample IP telephony solution using the HP ProCurve Networking architecture with Mitel telephony components. Figure 2. Bill of Materials HP ProCurve Networking Hardware Part Quantity Number Description Comments 1 J4139A Routing Switch 9304m 1 J4895A 9300 EP 16-Port 100/1000-T Module 1 J4885A 9300 EP 8-Port Mini-GBIC Redundant Management Module 1 J4147A 9304m/9308m Redundant Power Supply 4 J4819A Switch 5308xl 18 J4161A Switch xl 10/100-TX PoE Module TBD J4821A Switch xl 100/1000-T Module Optional data ports for servers 1 J8165A Switch 2650-PWR 48 PoE Ports 1 J8164A Switch 2626-PWR 24 PoE Ports 24 J8168A 600 RPS/EPS HP Software and Licenses Part Quantity Number Description Comments 1 J8172A ProCurve Manager Plus Mitel Communications Hardware Part Quantity Number Description Comments Universal Controller (250 User) Two controllers at headquarters for redundancy Universal Controller (100 User) For remote office Universal NSU (NA) Universal ASU (NA) E1/T1 Module (Dual Framer) Quad DSP Mitel IP Handsets Part Quantity Number Description Comments IP Phone Dark Grey One handset per user IP Appliance Dark Grey Advanced features for executives and managers Mitel Software and Licenses Part Quantity Number Description Comments Release 3.3 Base Software TBD User License Obtain sufficient licenses to match configuration TBD IP Device License Obtain sufficient licenses to match configuration Network Link License IP Networking License XNET Networking License 10

11 TBD NA Miscellaneous TBD NA 3300 Compression License (8 Channels) For Voice mail and TDP to IP compression 6600 Your Assistant 2.0 PRO Obtain sufficient licenses to match (1 User License) configuration OPS Manager NT NW Hub S/W only Power cords, interconnects and cables Sufficient to match configuration IP Telephony Solution Services HP ProCurve Networking and Mitel Networks are working together to deliver solutions that leverage LAN connectivity in voice communication systems. To ensure proper deployment of this type of solution, it is recommended that companies have a certified HP ProCurve Elite Reseller or Mitel Network Solutions Provider assess and design the right HP ProCurve IP Telephony solution to fit their needs. A selected number of HP ProCurve Elite Resellers and Mitel Network Solutions Providers are trained in HP ProCurve IP Telephony solutions and offer services designed to integrate new solution into existing networks. With an HP ProCurve Elite Reseller or Mitel Network Solutions Provider, a company is assured of having a partner and advisor that it can depend on and trust to deliver a best-in-class solution that will effectively address IT requirements and ultimately, its business needs. HP ProCurve Elite Partners and Mitel Network Solutions Providers are committed to excellence, quality and integrity. For a list of the HP ProCurve Elite Resellers and Mitel Network Solutions Providers that sell and deliver HP ProCurve IP Telephony solutions near you, go to Summary As described throughout this paper, a successful VoIP deployment depends primarily on two key factors: proper bandwidth provisioning and end-to-end QoS. Voice traffic should be kept in a separate VLAN, and given priority over data traffic. If the WAN is for VoIP, then voice QoS must also be enabled across the WAN link. The integration of HP ProCurve Networking infrastructure with Mitel Networks telephony equipment offers a best-of-breed end-to-end IP telephony solution based upon industry standards and interoperability. A networking solution from HP ProCurve and Mitel delivers exceptional call quality for enterprise network users, at an extremely competitive cost of ownership. 11

12 For More Information To learn more about HP ProCurve Networking solutions, contact your local HP sales representative or visit our website at: To learn more about HP ProCurve wireless site assessment and installation services, go to: For a list of the HP ProCurve Elite Resellers and Mitel Network Solutions Providers that sell and deliver HP ProCurve IP Telephony solutions near you, go to: Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein. 5/2004