Transcript E-5 - TMCnet

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
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Goal – Provide A Practical Perspective To The
Deployment of Branch Office IP Telephony Solutions
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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
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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
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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
Branch Office
Headquarters
IP Voice Servers
VoIP
Gateway
PSTN
Branch Office
Gateway
Analog
Telephony
Devices
IP NETWORK
Analog VoIP
Gateway
Benefits
• Feature Transparency
Analog
Phones
IP Phones
Fax
Machines
• Centralized Applications
• Centralized Management
• Cost Savings
IP Phones
IP Telephony Can Also Provide
Significant Savings
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Attractive ROI on LD calling
 Domestic calling can pay back in less than a year
 International calling can pay back in WEEKS!!
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Consolidation of Telephony Services
 Consolidate toll and inbound 800 calling
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Less Investment Than Traditional PBXs
 Up to 40% less expensive than traditional PBX solutions
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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
IP Telephony Brings Valuable Convergence
Sophistication To The Branch Office
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Open Architecture
 Ability to utilize different vendors to support
specific businesses needs
 PDA Phone – 802.11 Wireless Phone
 No vendor lock in!
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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
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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
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Integration with standard telephony devices
 Analog phones – Fax machines
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Access to the PSTN
 Local calls - 911
There Are A Variety Of Possible
Deployment Strategies
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Greenfield sites
 Build a completely converged infrastructure
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Begin in a branch office
 Smaller controlled environment
 Interoperate with the existing PBX at the main site
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Expand capacity at the main site with IP telephones
 Begin with a particular group or organization
 Expand to other organizations and branch offices
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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
IP Voice
Server
Mixed Infrastructure
PBX
Converged PBX
PBX
VoIP
Gateway
IP NETWORK
PSTN
Branch Office
Gateway
IP NETWORK
PSTN
IP NETWORK
PSTN
Branch Office
Gateway
Branch Office
Gateway
Deployment Issues Of IP TelephonyParticularly 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
H.323 Or SIP – Which To Use?
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Today, it is an H.323 world
 Established protocol – lots of it out there
 Lots of vendors’ equipment interoperates
 Telephony like signaling – complex
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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
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Both will likely survive and interoperate
Open Standards – Take advantage of it
Resources:
http://www.sipcenter.com
http:// www.protocols.com
Good Network Characteristics Are Required
To Support High Quality Voice
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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
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Resources:
http://www.erlang.com
WAN characteristics are more challenging
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Latency: Typical <100 ms
Maximum < 200ms
Jitter: Typical < one sample
Maximum < 40ms
Packet Loss: Typical – < 1%Maximum <5%
85% maximum utilization at peak traffic
Compression Can Minimize Bandwidth
Requirements On The WAN
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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
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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?
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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
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Deploy Redundant Voice Servers
Deliver power to the phones over
the Ethernet
 Ethernet switches deliver the
power on back-up power supplies
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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
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Real-time PSTN back-up when IP connectivity is lost
Two Case Studies Demonstrate The Value Of IP
Telephony In Supporting Branch Offices
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Municipality of Saint Hyacinthe, Quebec
Canada
 A full scale IP Telephony deployment with over 150
branch locations.
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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. Hyacinthe Municipality
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A community in Quebec, Canada
 150 Schools
 5 Health care facilities
 10 municipal government buildings
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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
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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
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Branch sites had requirements for a mix of new IP
telephones and the integration of existing analog
telephony equipment.
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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
Intercoms
Nortel i2004
IP Phones
Nortel
Succession
1000
A800
Paging
Systems
MAN
911 &
Hop Off
PSTN
A800
Nortel i2004
IP Phones
St. Hyacinthe, Canada:
Main Location
Analog
Devices
Cordless
Phones
St. Hyacinthe Remote Locations:
Schools, Municipal Buildings,
Garages and Healthcare facilities
St. Hyacinthe Realized A Variety of Cost
and Efficiency Benefits
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Standard benefits of an IP PBX
 Benefits of a centralized server architecture
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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
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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
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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
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Expand while preserving the
investment in traditional PBX
equipment.
John Akridge IP Telephony Network
Managed Buildings
Headquarters
bConvergent
OpenVoice
Servers
D2400
PSTN
A400/A800
Managed Buildings
IP NETWORK
T1
D2400
Construction Trailers
Existing PBX
Polycom
IP Phones
Provided John Akridge Cost Benefits And The
Ability To Quickly Expand Their System
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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
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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
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Summary
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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.
IP Telephony Implementation Strategies
There are issues that need
Uncertain
Maximize
to be understood!
Existing
17%
Equipment
A variety of approaches
42%
23%
allows you to start small and Mixed
Approach
grow your IP telephony
18%
network.
Deploy in New and
Replacement Scenarios
Source: Phillips Group InfoTech
Thank You!