Charles Rutledge VP Marketing Quintum Technologies, Inc. Out of Sight, But Not Out of Touch: Remote Office/ Branch Office IP Telephony Solutions Charles Rutledge VP Marketing Quintum Technologies, Inc.

Remote Office/ Branch Office IP Telephony Solutions Goal – Provide A Practical Perspective To The Deployment of Branch Office IP Telephony Solutions Enterprise Globalization Benefits of IP Telephony to the Branch Office Deployment Strategies IP Telephony Issues Branch Office Case Studies Summary

More Than Ever, Branch Offices Are Critical For Successful Businesses Increased globalization and aggressive competition. Local presence around the world Extend market reach and enhance customer care. Branch offices are a critical link between the enterprise and its clients Greater outsourcing Customers, suppliers and partners interact much more closely on projects and operations

One Of The Major Benefits Of IP Telephony Is Serving Branch Offices Headquarters Branch Office IP Voice Servers VoIP Gateway PSTN Branch Office Gateway Analog Telephony Devices IP NETWORK Analog VoIP Gateway Benefits Feature Transparency Centralized Applications Centralized Management Cost Savings Analog Phones Fax Machines IP Phones IP Phones

IP Telephony Can Also Provide Significant Savings Attractive ROI on LD calling Domestic calling can pay back in less than a year International calling can pay back in WEEKS!! Consolidation of Telephony Services Consolidate toll and inbound 800 calling Less Investment Than Traditional PBXs Up to 40% less expensive than traditional PBX solutions Administrative costs can be lowered A single voice and data network (Administration – Training) Centralized administration for multiple sites Lower costs for (MACs) Moves, Adds, and Changes

Source: Phillips Group InfoTech IP Telephony Brings Valuable Convergence Sophistication To The Branch Office Open Architecture Ability to utilize different vendors to support specific businesses needs PDA Phone – 802.11 Wireless Phone No vendor lock in! Improved Productivity For Users Unified Messaging 20 to 40 minutes saved per day per user! Web application integration 80% of Fortune 500 firms see the primary value of IP telephony as applications that help transform their business! Source: Phillips Group InfoTech

IP Telephony Places Unique Requirements On Branch Office Deployments Survivability: What happens when IP connectivity is lost? Local support of basic calling capabilities when connectivity with the server is lost Calls must be routed to the PSTN when the IP is not available Integration with standard telephony devices Analog phones – Fax machines Access to the PSTN Local calls - 911

There Are A Variety Of Possible Deployment Strategies Greenfield sites Build a completely converged infrastructure Begin in a branch office Smaller controlled environment Interoperate with the existing PBX at the main site Expand capacity at the main site with IP telephones Begin with a particular group or organization Expand to other organizations and branch offices You can start small and grow at a comfortable pace

- Deployment Strategy - Radical Revolution Or Easy Evolution Either may fit your needs best – or something in between IP PBX Mixed Infrastructure Converged PBX IP Voice Server PBX PBX VoIP Gateway PSTN IP NETWORK IP NETWORK IP NETWORK PSTN PSTN Branch Office Gateway Branch Office Gateway Branch Office Gateway

Deployment Issues Of IP Telephony- Particularly In The Branch Office Voice Quality QoS Bandwidth Requirements Protocol - Standards H.323 vs. SIP Legacy Infrastructure Network Integration Security NAT/Firewall - VPN Availability/Survivability Review Existing Infrastructure – Plan The Network

Resources: http://www.sipcenter.com http:// www.protocols.com H.323 Or SIP – Which To Use? Today, it is an H.323 world Established protocol – lots of it out there Lots of vendors’ equipment interoperates Telephony like signaling – complex SIP offers promise for the next generation Newer standard – Internet based Simpler – Create “sessions” Like HTTP – Wealth of available development resources Integration with web based applications Access via any SIP enabled technology – phone, video, IM Both will likely survive and interoperate Open Standards – Take advantage of it Resources: http://www.sipcenter.com http:// www.protocols.com

Resources: http://www.erlang.com Good Network Characteristics Are Required To Support High Quality Voice Business LANs today provide good network characteristics – Better voice than the PSTN Switched Ethernet to the desktop – lots of bandwidth Estimate bandwidth requirements LAN –G.711 with 20 ms packetization Assume worst case busy hour - 1 of 4 phones WAN characteristics are more challenging Latency: Typical <100 ms Maximum < 200ms Jitter: Typical < one sample Maximum < 40ms Packet Loss: Typical – < 1% Maximum <5% 85% maximum utilization at peak traffic Resources: http://www.erlang.com

Compression Can Minimize Bandwidth Requirements On The WAN VoIP on the WAN can provide “PSTN Quality” voice! Understand and minimize bandwidth requirements G.729/G.723 Silence suppression 35% savings Header compression 50% savings RTP multiplexing Up to 50% savings

QoS Can Help Support Good Voice Quality Support of VLAN and QoS capabilities IP Phones support VLAN tagging VLAN dedicated to voice and signaling traffic – 802.1q Prioritization – 802.1p VoIP devices support TOS or DiffServ Prioritize voice traffic through the routers and switches Required at every point in the network Resources: http://compnetworking.about.com/cs/virtuallans/

Security For The Media – Who Could Be Listening In? There are steps that can improve security of the media stream. Protection behind the firewall Support with some VoIP NAT capability Put VoIP equipment on virtual LANs and enable the security features on the switches. VPN routes between sites to support VoIP Latency? QoS? RTP encryption where possible

Survivability Is Critical – You Never Want To Lose The Phones Deploy Redundant Voice Servers Deliver power to the phones over the Ethernet Ethernet switches deliver the power on back-up power supplies Remote office gateway must be able to support calls when the connection to the server is lost Back-up call management – support IP calling to other locations Real-time PSTN back-up when IP connectivity is lost

Two Case Studies Demonstrate The Value Of IP Telephony In Supporting Branch Offices Municipality of Saint Hyacinthe, Quebec Canada A full scale IP Telephony deployment with over 150 branch locations. John Akridge Companies A migration to IP Telephony leveraging the existing PBX at the headquarters location.

One VoIP Network Supports The Telephony Needs For The St One VoIP Network Supports The Telephony Needs For The St. Hyacinthe Municipality A community in Quebec, Canada 150 Schools 5 Health care facilities 10 municipal government buildings Deployed a new IP-based telephony system throughout all the facilities, and integrated portions of the existing analog infrastructure.

St. Hyacinthe Deployed Two Central VoIP PBXs That Supported All The Locations The main location and 150+ branch locations were supported with 2 Nortel Succession 1000s. Nortel IP phones were deployed in the network with Quintum® Tenor® VoIP switches as branch office gateways. Quintum Tenor VoIP switches provided local connectivity to the PSTN, and integrated the analog devices into the Succession 1000 network.

Branch Locations Needed To Be Seamlessly Integrated Into The VoIP Network Branch sites had requirements for a mix of new IP telephones and the integration of existing analog telephony equipment. Existing analog phones - garages and hall phones Cordless phones used by hospital personnel Paging systems in the schools Intercoms/Elevator phones Fax Machines Branch sites also required local telephony connectivity. Survivability 911

St. Hyacinthe IP Telephony Network Nortel i2004 IP Phones Intercoms Nortel Succession 1000 A800 Paging Systems MAN 911 & Hop Off Cordless Phones PSTN Analog Devices A800 Nortel i2004 IP Phones St. Hyacinthe Remote Locations: Schools, Municipal Buildings, Garages and Healthcare facilities St. Hyacinthe, Canada: Main Location

St. Hyacinthe Realized A Variety of Cost and Efficiency Benefits Standard benefits of an IP PBX Benefits of a centralized server architecture Cost Savings Inter-location calling on the data network Long distance consolidation to central low cost T1 lines Fewer analog trunks at each branch location Branch office benefits Integration of existing analog telephony devices onto the Succession 1000 network Maintaining local connectivity for local calls and 911 Survivability if connectivity with the Succession 1000 is lost

John Akridge Companies Needed A Cost Effective Solution That Offered Flexibility A full-service real estate firm with over 12.5 M square feet of office, industrial, residential, retail and entertainment space . Deployed a new IP phone system Line growth at headquarters Connectivity to its 18 managed sites Construction trailers placed at job sites Expand while preserving the investment in traditional PBX equipment.

John Akridge IP Telephony Network Headquarters Managed Buildings bConvergent OpenVoice Servers D2400 PSTN A400/A800 Managed Buildings IP NETWORK D2400 T1 Construction Trailers Polycom IP Phones Existing PBX

Provided John Akridge Cost Benefits And The Ability To Quickly Expand Their System Expanded the capacity and capability of their voice system while keeping the existing PBX. Full feature set of the central site PBX at all branch office sites. Decreased cost on inter-office calling. Elimination of local telephone lines and key systems at construction trailers. Survivable systems that assured they would have phone service.

Key Steps To Follow When Deploying IP Telephony In The Branch Office Plan and evaluate for VoIP deployment Assessment of the existing infrastructure Evaluation of VoIP requirements Upgrade the IP as required Lay out the network Run a pilot – Identify any issues Full implementation

Maximize Existing Equipment Deploy in New and Replacement Scenarios Summary IP Telephony can successfully be deployed with voice quality at least as good at the PSTN. Branch office IP Telephony offers cost and productivity benefits. There are issues that need to be understood! A variety of approaches allows you to start small and grow your IP telephony network. Maximize Existing Equipment Deploy in New and Replacement Scenarios Mixed Approach Uncertain 42% 18% 23% 17% Source: Phillips Group InfoTech

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