1. IP Telephony Migration Ed Wright Sr. Sales Engineer, ShoreTel Inc. September 2008

2. 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 ACD PSTN IP WAN PSTN

3. 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 IP WAN PBX VM ACD PBX VM ACD PBX VM ACD PSTN

4. 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 IP WAN PSTN VM ACD GatewayCallProcessorGateway Gateway ITSP PSTN ITSP PSTN ITSP

5. 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 IP WAN PSTN VM ACD GatewayCallProcessorGateway Gateway ITSP PSTN ITSP PSTN ITSP

6. 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.MasterACD PSTN Regional Office Headquarters Office Branch Office PSTN VM ACD GatewayCallProcessorGateway CallProcessor VM ACD VM ACD CallProcessor NetworkManager Gateway IP WAN PSTN ITSP PSTN ITSP PSTN ITSP

7. 7 Gateways in Routers Gateways: – Single point of failure – Command line interface – No system admin integration to primary call controllerNetworkManager MasterACD PSTN Regional Office Headquarters Office Branch Office PSTN VM ACD CallProcessorCallProcessor CallProcessor VM ACD VM ACD IP WAN PSTN ITSP PSTN ITSP PSTN ITSP

8. 8 Server Dial Tone Gateways: – 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 featuresNetworkManager PSTN Regional Office Headquarters Office Branch Office PSTNMasterACD VM ACD VM ACD VM ACD Call Processor IP WAN PSTN ITSP PSTN ITSP PSTN ITSP

9. 9 Applications = More Servers Gateways : – 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 MessagingNetworkManager PSTN Regional Office Headquarters Office Branch Office PSTN Call Processor MasterACD ACD ACD ACD PSTN IP WAN UM UM UM PSTN ITSP PSTN ITSP PSTN ITSP

10. 10 Applications = More Servers Gateways: – 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, ACDNetworkManager PSTN Regional Office Headquarters Office Branch Office PSTN Call Processor UM UM UM PSTN Master ACD IP WAN ACD ACD ACD PSTN ITSP PSTN ITSP PSTN ITSP

11. 11 Applications = More Servers Gateways: – 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 IP WAN Call Processor UM UM UM ACD ACD Master ACD Management ACD e911 e911 Desktop Call Control Paging Operator PSTN ITSP PSTN ITSP PSTN ITSP

12. 12 Another Way- Distributed ApproachNetworkManager MasterACD PSTN Regional Office Headquarters Office Branch Office PSTN VM ACD GatewayCallProcessorGateway Gateway CallProcessor CallProcessor VM ACD VM ACD IP WAN

13. 13 Distributed Gateways Seamless scalability Plug and play Flexible allocation of resources: – IP phones – Analog trunks – Analog stations – SIP trunksNetworkManager MasterACD PSTN Regional Office Headquarters Office VM ACD CallProcessorCallProcessor CallProcessor VM ACD VM ACD IP WAN PSTN Branch Office PSTN ITSP PSTN ITSP PSTN ITSP

14. Distributed Call Processing Distributed call processing – Appliance-based – No single point of failure – Minimization of spinning media – Real time operating systemNetworkManager MasterACD PSTN Regional Office Headquarters Office PSTN VM ACD VM ACD VM ACD IP WAN PSTN Branch Office 14 PSTN ITSP PSTN ITSP PSTN ITSP

15. Trunking Flexibility TDM and SIP compliant – Full TDM trunk support – Seamless migration – Address SIP Security – Certified ITSP portfolioNetworkManager MasterACD PSTN Regional Office Headquarters Office VM ACD VM ACD VM ACD IP WAN Branch Office 15 PSTN ITSP PSTN ITSP PSTN ITSP

16. 16 Unified Applications Cohesive suite of UC applications Consolidated platform Rich API environment Open, standards-basedNetworkManager MasterACD PSTN Regional Office Headquarters Office Branch Office PSTN IP WAN PSTN ITSP PSTN ITSP PSTN ITSP

17. 17 Unified Management Single image system Centralized management Intuitive, TLA and FLA-free PSTN Regional Office Headquarters Office Branch Office PSTN IP WAN PSTN ITSP PSTN ITSP PSTN ITSP

18. 18 Thank You!