ip telephony tech brief-hp

8/3/2019 IP Telephony Tech Brief-HP

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ProCurve Networking by HP

IP Telephony SolutionTechnical Brief

Introduction ............................................................................................................... 2 Business and IT Needs and Benefits............................................................................... 2 Solution Topology ....................................................................................................... 2

ProCurve Switches ................................................................................................... 3 Mitel 3300 Integrated Communications Platform (ICP) Controller .................................... 4 Mitel 3300 Network Services Unit (NSU) ...................................................................... 4 Mitel 3300 Analog Services Unit (ASU) ........................................................................ 4 Mitel IP Phones ........................................................................................................ 4 ProCurve Management.............................................................................................. 5 Mitel 3300 ICP Management ...................................................................................... 5

Solution Overview and Design....................................................................................... 5 Networking Architecture Best Practices........................................................................ 5 Design and Implementation Process............................................................................ 5 End-to-End QoS....................................................................................................... 6

Solutions Value........................................................................................................... 7 Flexibility to Grow with the Customer ............................................................................. 7

Expandability........................................................................................................... 7 Resiliency and High Availability .................................................................................. 7 Interoperability........................................................................................................ 8

Detailed Configuration Information ................................................................................ 8 IP Telephony Solution Services...................................................................................... 9 Summary................................................................................................................. 10 For more information................................................................................................. 11



Introduction

IP telephony is considered the next-generation solution for communications infrastructure. Tosupport an IP telephony solution, the enterprise network must be a multi-service network —anetwork on which voice, video, and data can coexist over a single IP-based infrastructure. ForIP telephony, enterprises can choose to continue to use existing telephony equipment andmigrate to IP telephony over time at a pace that makes sense for them, with minimaldisruption. Alternatively, they may choose to replace the existing telephony equipment with IPtelephony products.

ProCurve IP Telephony solutions help customers get more from their networks by easily addingvoice capability to an existing network. This solution combines industry-leading IP switchinginfrastructure with IP telephony products for true communications convergence. ProCurveNetworking is committed to the development of products and solutions based on industrystandards—providing our customers choice and flexibility. Mitel Networks is equally committedto industry standards. ProCurve Networking and Mitel Networks have leveraged their 50 yearsof combined experience in network and IP telephony to deliver proven and tested end-to-endVoice over IP (VoIP) solutions. These solutions support the ProCurve Networking Adaptive EDGEArchitecture™, 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 benefitsof a converged IP network – cost savings, advanced applications, and new ways of collaboratingacross business objectives. IP telephony provides enterprises with a core platform for businessinnovations such as:

• Business communications collaboration – unified messaging, virtual call centers andinteractive voice response (IVR), which will streamline operations and improve businesscommunications.

• Business voice features

• Teleworker productivity

In choosing a network strategy, enterprises must ensure that the converged network does notcompromise the quality of voice or data traffic. It is important to consider such factors as:

• Resiliency

• Security

• 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 headquartersvia a wide area network (WAN), using ProCurve Networking equipment in conjunction with aMitel Networks 3300 Integrated Communications Platform (ICP) at each site.

The offices are connected via a packet-switched transmission network (PSTN) and analog trunksto ensure against loss of service in the event that the WAN is unavailable. The local PSTN alsoensures that local phone service does not need to traverse the WAN link and provides service toanalog devices such as fax, modem, and emergency 911 services.

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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 anexpensive forklift replacement.

Legend

10/100BaseT GigEfiber Analog (POTS) TDM (ISDN PRI) Q. SIG PRI

Analog (POTS) TDM (ISDN PRI) Q. SIG PRI

ProCurve Routing

Switch 9300mseries

Authentication

Servers

Mitel NSU

Mitel 3300 ICP

Corporate headquarters

(400 employees)

Remote office

(50 employees)

Third-party PBX

Mitel ASU

Mitel 3300 ICP

ProCurve 600 RPS/EPS

ProCurve Switch 2650PWR

Laptop PC

WAN WAN

PSTN

PSTN

Fax

Analogphone

Fax Analog trunk Analog trunk

ISDN PRI ISDN PRI E1/T1

module

T1 T1

Mitel ASU

PC Laptop PC

HP 610 RPS/EPS

PC

610 RPS/EPS

ProCurve Switch

5300xl series with

10/100 PoE modules

Clients

ProCurveManager

ProCurve Switch

5300xl series with

10/100 PoE modules

Analogphone

Figure 1. ProCurve IP Telephony Solution Overviews

ProCurve Switches

ProCurve Networking products provide IP connectivity, supporting a variety of trafficprioritization 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.

ProCurve Networking switches can provide power to IP telephone handsets over standard Cat-5Ethernet cable via the IEEE 802.3af Power over Ethernet (PoE) Standard, with redundant PoEpower.

ProCurve Switch2600 series

• Layer 2 and 3 managed stackable

• 2650-PWR 48 10/100 PoE ports

• 2626-PWR 24 10/100 PoE ports

• 2600-8-PWR 8 10/100 PoE ports

ProCurve Switch5300xl serieswith expandablePoE modules

• Layer 2, 3 and 4 managed chassis

• 76.8 Gbps non-blocking crossbar switchingfabric with up to 48 million pps throughput

• Up to 192 10/100/1000 ports and 6 mini-GBICslots

• 5304 up to 96 ports (10/100) at 15.4W PoE*

• 5308 up to 192 ports (10/100) at 15.4W PoE*

* requires ProCurve 600 RPS/EPS or 610 EPS for PoE

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ProCurveRouting Switch9300m series

• Layer 3 and 4+ managed chassis

• 10/100/1000/10 Gigabit

• Up to 28 10 GbE ports, 232 Gigabit, 672 auto-sensing 10/100 ports or a combination

ProCurve

600 Redundantand ExternalPower Supply(J8168A)

• Redundant power to any one of up to six

stackable switches

• Fully redundant PoE power for 2626-PWR forall 24 ports at 15.4W each

• Redundant PoE power for 2650-PWR for all 48ports at average 7.6W each

ProCurve610 ExternalPower Supply(J8169A)

• Provide redundancy via EPS backup powerconnection

• 816 total watts of power

• PoE power for up to 4 ProCurve Switch 5300xl10/100-TX PoE modules

Mitel 3300 Integrated Communications P latform ( ICP)Controller

The Mitel Networks 3300 ICP is a converged IP-PBX system that uses the IP network forconnecting IP telephony devices. Key components include the Mitel 3300 ICP Controller,network services unit (NSU) and analog services unit (ASU). A distributed architecture pushesintelligence and call control to the edge of the network, where it is needed.

The Mitel 3300 ICP Controller provides the voice, signaling, central processing andcommunications resources for the IP telephony system. It also houses an optional integratedvoice mail system as well as embedded applications such as ACD (automatic call distribution),embedded systems management, or integration into hotel/motel property managementsystems.

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-locatedor geographically dispersed), but can be managed as a single network from any location.

Mitel 3300 Netw ork Services Unit (NSU)

The Mitel 3300 NSU provides digital trunks to PSTN over T1 or E1 links to the 3300 ICP, withsupport 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 SignalingSystem) and four Loop Start (LS) trunk CLASS ports. The 3300 ASU provides four integralSystem Fail Transfer (SFT) relays for direct connection between an analog telephone and LoopStart trunk in the event of a system or power failure. It also provides connections for Music onHold (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)

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ProCurve Management

• ProCurve Manager/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 andmanagement 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) LANassessment, training and various levels of support services.

Solution Overview and Design

Networking Architecture Best P ractices

ProCurve recommends these best practices when designing network solution:

• Deploy open-standards based solutions to reduce the likelihood of massive redesign down theroad.

• Provision sufficient bandwidth on WAN links.• Prioritize voice traffic over data.

• Consider the adoption of a Service Level Agreement (SLA) with the service provider to specifynetwork 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’sessential to determine the ability of a company’s network to support voice traffic, so that anyobstacles can be remove before deployment – for example, insufficient bandwidth or QoS

settings. An assessment generates traffic and measures actual jitter and delay values acrossvarious segments of the network. The results indicate any significant performance issuesthat might jeopardize voice quality on the network. A company also needs to know inadvance how many voice calls its current network can safely support. In addition, a propernetwork baseline can assist with subsequent deployment and troubleshooting.

2. Determine the additional bandwidth and performance that will be required for new voiceservices.

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 themaximum number of desired voice calls and business-critical data applications. Each activetelephone 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 tounderstand the network constraints so enough bandwidth is available for worst-casescenarios.

3. Design a network topology including the IP telephony equipment

A well-designed IP Telephony network consists of a high-bandwidth, redundant core networkand an access network for edge device access. The core should have uninterruptible powersupply (UPS) backup and be cross-connected in a redundant configuration, so that the failureof a single device will not result in a total network outage. The access network shouldprovide power via IEEE 802.3af (POE) Standard and use UPS backup to provide for reliablepower for E911 service.

IP telephony deployments typically use a variety of trunks to provide PSTN connections for

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local calls, to ensure resiliency in the event of a WAN failure, and to provide a migration pathwith 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 asneeded; 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 strategybefore expanding the implementation.

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 networkperiodically to assess the impact of new applications, increases in network usage, and anyother 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 mustbe 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 QualityThree primary network impairments can affect voice quality:

Packet loss – the percentage of undelivered packets in the data network. Data packets canrequest a retransmission, while voice packets are simply discarded, causing gaps in theconversation. For toll-quality voice, ProCurve recommends packet loss of less than 1%.

Jitter – the variability in packet arrival at the destination. Unlike data packets, voice packetsmust arrive at regular intervals, to avoid a distortion in sound. For toll-quality voice, ProCurverecommends 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 networkfrom destination to destination. Voice is a delay-sensitive application; as the delay increases,voice quality is impacted. For toll-quality voice, 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 thanbursty data traffic on every link along the data path between IP telephones. ProCurverecommends the use of VLAN topologies to fully isolate voice and data networks and no routingbetween them. This allows network managers to create end-to-end QoS policies in a

heterogeneous multi-vendor deployment of switches, routers and end-hosts.

ProCurve switches offer a weighted fair queuing (WFQ) mechanism to minimize delay and jitterfor 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-prioritytraffic types, like VoIP, get the bandwidth they need when they need it without starving otherbusiness critical applications.

The use of VLANs also ensures that excessive broadcast and multicast packets present on manydata networks will not disrupt IP telephony equipment or affect voice quality. Along with802.1p/Q priority tagging, VLANs offer a significant security benefit by providing a convenientway of isolating IP telephony equipment from data traffic.

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Because the VLAN tag is not retained when the frame is forwarding over WAN links, a Layer 3prioritization method is required. ProCurve 5300xl series switches resolve this issue bymapping VLAN/802.1p priority values to DSCP or ToS prioritization, to ensure that voice packetsreceive a higher priority than data traffic.

Solutions Value

There are numerous benefits to an IP telephony solution such as the one described above. Tobegin with, a cost-effective standards-based solution reduces the likelihood of expensive

massive replacement down the road. By choosing components that are designed forinteroperability 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 easymanagement for moves, additions and changes.

Also, there are several advantages to assigning a different subnet address to voice and dataVLANs: increased security between voice and data traffic; ensuring that all call control and voicetraffic 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 businessbenefits. An IP telephony network greatly reduces the cost of network management andownership. At the same time, IP telephony fosters business innovation by supporting newapplications and communication tools such as unified messaging, intelligent voice recognition,messaging mobility, and contact/relationship management tools — all of which can drive newrevenue streams. This combination of cost savings and business innovation provides newopportunities 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 telephonysolution. 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 callhandling, integrated communications and collaboration

• “Plug and work” teleworking – transparent access to the corporate voice network from anylocation with broadband Internet access

• ACD and automatic route selection.

Resiliency and High Availability

The reliability of communication systems is a critical requirement for enterprise business.Enterprises have come to expect high reliability of traditional telephony systems.

To ensure that a converged network is highly reliable, these key components should be includedin the network design:

• Backup and redundant power

• UPS eliminate the impact of power glitches and allows for a graceful system shutdown in theevent of an extended outage. ProCurve PoE switches use a redundant external power supply(RPS/EPS) that minimizes the impact of a power supply failure, offering an indispensable wayto provide dial tone during power outages.

• Alternate network connectivity

• Distributed resilient networks offer the ability to route around failed or inaccessible portions ofan IP network. Alternate network connectivity can be achieved by using cross-connected or

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meshed switches in a redundant configuration, coupled with the use of PSTN trunk or analogtrunk access between controllers to ensure against loss of service or call features if the WANis unavailable.

• No single point of failure

• The ability to locate resiliency at different locations removes the concern for a total systemoutage due to a catastrophic event such as water damage or fire.

The efficient use of existing hardware in a distributed topology can significantly reducehardware 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 theevent of a networking failure between the phone and the ICP. Any calls in process aremaintained, 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 ProCurve Networking Adaptive EDGE Architecture andthe Mitel 3300 ICP provides for resiliency throughout the network, eliminating the risk of asingle point of failure.

Interoperability

The ProCurve Networking solution offers broad support for open standards that promote

interoperability with VoIP products. Open standards allow companies to install VoIP in selectedlocations while maintaining their existing investment in PBX equipment. For example, the Mitel3300 ICP integrates with any third-party PBX. It provides an incremental migration path toVoIP while preserving existing investments, with support for existing analog equipment such asfax machines, modems, conference room speakerphones and emergency 911 phones.

Detailed Configuration Information

Figure 2 presents a bill of materials for a sample IP telephony solution using the ProCurveNetworking architecture with Mitel telephony components.

ProCurve Networking HardwareQuantity Part Number Description Comments

1 J4139A Routing Switch 9304m

1 J4895A9300 EP 16-Port100/1000-T Module

1 J4885A

9300 EP 8-Port Mini-GBICRedundant ManagementModule

1 J4147A9304m/9308mRedundant Power Supply

4 J4819A Switch 5308xl

18 J4161A Switch xl 10/100-TX PoEModule

8 J8169A 610 EPS

TBD J4821ASwitch xl 100/1000-TModule Optional data ports for servers

1 J8165A Switch 2650-PWR 48 PoE Ports

1 J8164A Switch 2626-PWR 24 PoE Ports

2 J8168A 600 RPS/EPS

PROCURVE Software and Licenses

Quantity Part Number Description Comments

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1 J8172A ProCurve Manager Plus

Mitel Communications Hardware


2 500029703300 Universal Controller(250 User)

Two controllers at headquartersfor redundancy

1 500022113300 Universal Controller(100 User) For remote office

3 50001270 3300 Universal NSU (NA)

3 50001266 3300 Universal ASU (NA)

1 500035603300 E1/T1 Module (DualFramer)

3 50002979 3300 Quad DSP

Mitel IP Handsets


430 50002818 5220 IP Phone Dark Grey One handset per user

20 500028205240 IP Appliance DarkGrey

Advanced features for executivesand managers

Mitel Software and Licenses


1 500033463300 Release 3.3 BaseSoftware

TBD 54000291 3300 - 1 User LicenseObtain sufficient licenses tomatch configuration

TBD 540002943300 - 1 IP DeviceLicense

Obtain sufficient licenses tomatch configuration

3 540003033300 - Network LinkLicense

3 54000540 IP Networking License

3 54000497

3300 - XNET Networking

License

9 54000650

3300 CompressionLicense(8 Channels)

For Voice mail and TDP to IPcompression

TBD 53001040

6600 Your Assistant 2.0PRO(1 User License)

Obtain sufficient licenses tomatch configuration

19148-000-034-NA

OPS Manager NT NW HubS/W only

Miscellaneous

TBD NAPower cords,interconnects and cables Sufficient to match configuration

Figure 2. Bill of Materials

IP Telephony Solution Services

ProCurve Networking and Mitel Networks are working together to deliver solutions that leverageLAN connectivity in voice communication systems. To ensure proper deployment of this type of solution, it is recommended that companies have a certified ProCurve Elite Reseller or MitelNetwork Solutions Provider assess and design the right ProCurve IP Telephony solution to fittheir needs. A selected number of ProCurve Elite Resellers and Mitel Network Solutions

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Providers are trained in ProCurve IP Telephony solutions and offer services designed tointegrate new solution into existing networks.

With an 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 solutionthat will effectively address IT requirements and ultimately, its business needs. ProCurve ElitePartners and Mitel Network Solutions Providers are committed to excellence, quality andintegrity.

For a list of the ProCurve Elite Resellers and Mitel Network Solutions Providers that sell anddeliver ProCurve IP Telephony solutions near you, go to http://www.procurve.com.

Summary

As described throughout this paper, a successful VoIP deployment depends primarily on two keyfactors: proper bandwidth provisioning and end-to-end QoS. Voice traffic should be kept in aseparate VLAN, and given priority over data traffic. If the WAN is for VoIP, then voice QoS mustalso be enabled across the WAN link.

The integration of ProCurve Networking infrastructure with Mitel Networks telephony equipmentoffers a best-of-breed end-to-end IP telephony solution based upon industry standards andinteroperability. A networking solution from ProCurve and Mitel delivers exceptional call qualityfor enterprise network users, at an extremely competitive cost of ownership.

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http://www.procurve.com/

http://www.procurve.com/



For more information

To learn more about ProCurve Networking solutions, contact your local PROCURVE salesrepresentative or visit the company’s website at: www.procurve.com.

For a list of ProCurve Elite Partners that can provide ProCurve Mobility Infrastructure solutions,go to www.procurve.com.

To find out more about

ProCurve Networkingproducts and solutions,

visit our web site at

www.procurve.com

4AA0-1806ENW, 08/2005

© 2005 Hewlett-Packard Development Company, L.P. The information containedherein is subject to change without notice. The only warranties for HP products andservices are set forth in the express warranty statements accompanying suchproducts and services. Nothing herein should be construed as constituting anadditional warranty. HP shall not be liable for technical or editorial errors oromissions contained herein.

ip telephony tech brief-hp

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