ip telephony migration ed wright sr. sales engineer, shoretel inc. september 2008
TRANSCRIPT
IP Telephony Migration
Ed WrightSr. Sales Engineer, ShoreTel Inc.
September 2008
2
Legacy Phone World – Variety of Positives
• Reliable– Built on reliable OS, typically VxWorks– No moving parts, outside of fan– 7-11 year realistic life-span– Each site remotely survivable
• Workhorses– Phones had strong functionality
Regional Office
Headquarters Office
Branch Office
PBX
VM
ACD
PBX
VM
ACD
PBX
VM
ACDPSTN
IPWAN
PSTN
PSTN
3
Legacy Phone World – Host of Negatives• Each site is a silo unrelated to other sites• Applications are expensive additions
– Unified Communications, ACD, etc.• Management is per system, per site and
usually outsourced– Each new site multiplies the amount of management time– 3 PBXs, 3 VMs and 3 ACDs to manage
• Feature disparity between sites– Reporting, phone portability, ACD applications, paging, etc.
• A single image is impossible– Difficulty in administration, communication and
application extensions between sites
PSTN
Regional Office
Headquarters Office
Branch Office
IPWAN
PBX
VM
ACD
PBX
VM
ACD
PBX
VM
ACD
PSTN
PSTN
4
IP Telephony Offers New Possibilities• Drawbacks of legacy system become strengths of UC
solution . . . benefits include . . .– Applications are easy to add, can be shared across one
network, and many come standard– Management is administered via a GUI or Web interface, and
each site is part of a single image solution– Features are transparent between sites, as finally users can
realize a single image solution: one brain equals one system!– Although they go by different names, components for IP
telephony systems are analogous, and consistent in their architecture.
PSTN
Regional Office
Headquarters Office
Branch Office
IPWAN
PSTN
VMVM
ACDACDGatewayGateway
CallCallProcessorProcessor
GatewayGateway
GatewayGateway
PSTN
PSTNITSP
PSTNITSP
PSTNITSP
5
IP Telephony Concerns – Single Headed• While the failures of legacy systems became VoIP’s
strengths, so do the strengths of legacy solutions become the weaknesses of VoIP systems
• Server-centric: spinning media MTBF is less than 5 years (only some on real time OS)
• Centralized brains make remote survivability a substantive concern
• Limited intelligence in the gateway is sometimes an option
• True remote survivability requires a call processor in each site
PSTN
Regional Office
Headquarters Office
Branch Office
IPWAN
PSTN
VMVM
ACDACDGatewayGateway
CallCallProcessorProcessor
GatewayGateway
GatewayGateway
PSTN
PSTNITSP
PSTNITSP
PSTNITSP
6
UC Concerns – Multi-Headed• With a call processor in each site, many
benefits of UC are lost:– System admin must manage multiple systems– Feature transparency for users across sites is
lost: no ACD, paging, management, phone portability, etc.
– Each site will require individual applications– Additional applications will be required to assist
in the complexity of managing multiple sites: management augmentations and master ACD applications, etc.
MasterMasterACDACD
PSTN
Regional Office
Headquarters Office
Branch Office PSTN
VMVM
ACDACDGatewayGateway
CallCallProcessorProcessor
GatewayGateway
PSTN
CallCallProcessorProcessor
VMVM
ACDACD
VMVM
ACDACDCallCall
ProcessorProcessor
NetworkNetworkManagerManager
GatewayGateway
IPWAN
PSTNITSP
PSTNITSP
PSTNITSP
7
Gateways in RoutersGateways:– Single point of failure– Command line interface– No system admin integration to primary call
controller
NetworkNetworkManagerManager
MasterMasterACDACD
PSTN
Regional Office
Headquarters Office
Branch Office PSTN
VMVM
ACDACD
CallCallProcessorProcessor
CallCallProcessorProcessor
CallCallProcessorProcessor
VMVM
ACDACD
VMVM
ACDACDPSTN
IPWAN
PSTNITSP
PSTNITSP
PSTNITSP
8
Server Dial ToneGateways:– Single point of failure– Command line interface– No system admin integration to primary call controller
Call processing:
– Centralized, Windows or Linux OS, hard disk, – Redundancy required– Limited survivability in routers with limited features
NetworkNetworkManagerManager
PSTN
Regional Office
Headquarters Office
Branch Office PSTN
MasterMasterACDACD
VMVM
ACDACD
VMVM
ACDACD
VMVM
ACDACDPSTN
Call ProcessorCall Processor
Call ProcessorCall Processor
Call ProcessorCall Processor
Call ProcessorCall Processor
IPWAN
PSTNITSP
PSTNITSP
PSTNITSP
9
Applications = More ServersGateways:
– Single point of failure– Command line interface
Call processing: – Centralized, Windows or Linux OS, hard disk, – Redundancy required– Limited survivability in routers with limited features
– Applications: Unified Messaging
NetworkNetworkManagerManager
PSTN
Regional Office
Headquarters Office
Branch Office PSTN
Call ProcessorCall Processor
Call ProcessorCall Processor
Call ProcessorCall Processor
Call ProcessorCall Processor
MasterMasterACDACD
ACDACD
ACDACD
ACDACDPSTN
IPWAN
UMUM
UMUM
UMUM
PSTNITSP
PSTNITSP
PSTNITSP
10
Applications = More ServersGateways:– Single point of failure– Command line interface
Call processing:
– Centralized, Windows or Linux OS, hard disk, – Redundancy required– Limited survivability in routers with limited features
– Applications: Unified Messaging, ACD
NetworkNetworkManagerManager
PSTN
Regional Office
Headquarters Office
Branch Office PSTN
Call ProcessorCall Processor
Call ProcessorCall Processor
Call ProcessorCall Processor
Call ProcessorCall Processor
UMUM
UMUM
UMUMPSTN
Master ACDMaster ACDIPWAN
ACDACD
ACDACD
ACDACD
PSTNITSP
PSTNITSP
PSTNITSP
11
Applications = More ServersGateways:– Single point of failure– Command line interface
Call processing: – Centralized, Windows or Linux OS, hard disk, – redundancy required– Limited survivability in routers with limited features
– Applications: Unified Messaging, ACD, 911, Presence, Desktop Call Control, Video, Paging, Management
Regional Office
Branch Office
IPWAN
Call ProcessorCall Processor
Call ProcessorCall Processor
Call ProcessorCall Processor
Call ProcessorCall Processor
UMUM
UMUM
UMUM
ACDACD
ACDACD
Master ACDMaster ACD
ManagementManagement
ACDACD
e911e911
e911e911Desktop Call ControlDesktop Call Control
PagingPaging
OperatorOperator
PSTNITSP
PSTNITSP
PSTNITSP
12
Another Way- Distributed Approach
NetworkNetworkManagerManager
MasterMasterACDACD
PSTN
Regional Office
Headquarters Office
Branch Office
PSTN
PSTN
VMVM
ACDACDGatewayGateway
CallCallProcessorProcessor
GatewayGateway
GatewayGateway
CallCallProcessorProcessor
CallCallProcessorProcessor
VMVM
ACDACD
VMVM
ACDACD
IPWAN
13
Distributed Gateways
• Seamless scalability• Plug and play• Flexible allocation of resources:
– IP phones– Analog trunks– Analog stations– SIP trunks
NetworkNetworkManagerManager
MasterMasterACDACD
PSTN
Regional Office
Headquarters Office
VMVM
ACDACD
CallCallProcessorProcessor
CallCallProcessorProcessor
CallCallProcessorProcessor
VMVM
ACDACD
VMVM
ACDACD
IPWAN
PSTN
Branch Office PSTNPSTNITSP
PSTNITSP
PSTNITSP
Distributed Call Processing
• Distributed call processing
– Appliance-based– No single point of failure– Minimization of spinning media– Real time operating system
NetworkNetworkManagerManager
MasterMasterACDACD
PSTN
Regional Office
Headquarters Office
PSTN
VMVM
ACDACD
VMVM
ACDACD
VMVM
ACDACD
IPWAN
PSTN
Branch Office
14
PSTNPSTNITSP
PSTNPSTNITSP
PSTNPSTNITSP
Trunking Flexibility
• TDM and SIP compliant
– Full TDM trunk support– Seamless migration– Address SIP Security – Certified ITSP portfolio
NetworkNetworkManagerManager
MasterMasterACDACD
PSTN
Regional Office
Headquarters Office
VMVM
ACDACD
VMVM
ACDACD
VMVM
ACDACD
IPWAN
Branch Office
15
PSTNPSTNITSP
PSTNPSTNITSP
PSTNPSTNITSP
16
Unified Applications
• Cohesive suite of UC applications• Consolidated platform• Rich API environment• Open, standards-based
NetworkNetworkManagerManager
MasterMasterACDACD
PSTN
Regional Office
Headquarters Office
Branch Office PSTN
IPWAN
PSTN
PSTNPSTNITSP
PSTNPSTNITSP
PSTNPSTNITSP
17
Unified Management
• Single image system• Centralized management• Intuitive, TLA and FLA-free
PSTN
Regional Office
Headquarters Office
Branch Office PSTN
IPWAN
PSTN
PSTNPSTNITSP
PSTNPSTNITSP
PSTNPSTNITSP
18
Thank You!