1. Voice over Ethernet SIP Trunk service for large enterprises

2. Objectives Appreciate where SIP Trunks fit in Understand a typical deployment architecture Work out when SIP Trunks are ideal Establish some great questions to ask vendors

3. A little more about our Group UK’s leading provider of B2C and B2B data networking and telephony services 4.25M broadband base (‘10: 4M) £500M+ investment in UK’s largest Next Generation Network 2003 unbundled exchanges (89%coverage)Three times more than BT, twice as many as C&W UK’s largest Ethernet network 1000+ exchange PoPs - deployed in only 5 months - expanding to 1400 More VoIP traffic than any other UK network Over 250Gbits/second, 2 Billion total VOIP minutes Successful, profitable and growing £1.7Bn revenue - up 21.7%, £230M EBITDA

5. 2 Billion total VoIP minutes(data accurate November 2010)

6. Our network is our advantage More unbundled exchanges than any other network Unique in having both SMPF (broadband-only) & MPF (line & broadband) infrastructure Coverage Capacity/speed (data as reported on www.samknows.co.uk Dec 2010 plus TTG own data) 3/8/2011 CONFIDENTIAL 5

7. Technology Model Shift Pre 2010Individual delivery of individual services Post 2010Converged connectivity integrated applications Mature technologies Multiple suppliers Little differentiation Price sensitive Application proliferation Service Convergence Underpinned by connectivity

8. Voice over Ethernet TalkTalk Business SIP Trunk service Business grade alternative to ISDN30 Fully managed service from single supplier Cost effective for businesses with more than 120 voice channels Number and capacity flexibility Ideal solution for businesses with a high call volumes

9. What is a SIP Trunk? SIP Trunk?

10. SIP Trunk Service Architecture Session Border Controller TalkTalk Business SIP Trunks

11. Why an SBC - what does it do? On-site monitoring and demarcation point Allows us to get MI on every call’s quality Provides a firewall between the network and LAN Enables legal intercept compliance

12. Specification Suitable for 120 - 750 voice channels per connection Outbound calls with choice of presentation number 99.99% service availability on our resilient solution Voice quality to match ISDN30 Target fix times backed by service credits

13. Benefits End-to-end management Project management from start to finish Specialist design team ensures the capacity and resiliency you need We provide the full solution, only one supplier to call with all queries Monitored 24/7 In the unlikely event of a fault we provide a one hour response and a target fix time of 5 hours Cost-efficient Directly connected to our network so there are no third party costs

14. Benefits continued… Reliability and quality Voice over Ethernet is a fibre-based solution, which provides significantly more reliability Provides 99.99% availability with our resilient service It’s flexible Use a number of your choice for making outbound calls – the presentation number Also has the ability to terminate multiple geographic numbers at one location One trusted supplier We deliver the complete end-to-end service, so we always take full responsibility

15. TalkTalk Business SIP Trunk service

16. SIP Trunk selection considerations Do I need more than 120 voice channels? Will I get a managed service and SLA with teeth? What if I want to keep my numbers? Is it connected to a great IP based NGN? Has the protocol been tested for interoperability? Can the carrier demonstrate cost savings?

18. Understand a typical deployment architecture

19. Work out when SIP Trunks are ideal