1. XO® ENTERPRISE SIP

2. XO® Enterprise SIP XO® Enterprise SIP is a dynamic, end-to-end, IP-based voice communications solution for businesses with multiple locations Provides high-capacity connectionsusing Session Initiation Protocol (SIP) technologyto a headquarters location, or to a limited number of primary locations, that in turn connect to the customer’s private network to serve additional branches SIP Connections can be to Session Border Controller-SBC, IP-PBX or Fax Server devices Private network can be customer’s private network, or the award-winning XO MPLS IP-VPN solution Helps businesses make the transition to company-wide, next generation Voice over IP (VoIP) technology Eliminates need to buy and manage lines at each location through contracts with multiple local exchange carriers

4. Lower operating costs and eliminate multiple carriers for voice lines at each location Reduce capital costsby eliminating PBXs at every location Extend VoIP servicesto branch locations using your Wide Area Network Increase network efficiency by using idle bandwidth at one location for demands at others Carry your site-to-site callingon your wide area network Gain business continuitywith failover from one enterprise SIP connection to another, built-in network redundancy and automatic call routing Use call compression and bursting features – so you always have additional call capacity when you need it Leverage existing investmentsin VoIP phone systems Make it easy withflexible pricing and one provider Advantages of XO® Enterprise SIP

5. Before XO® Enterprise SIP BEFORE: Enterprises had to work with more than one local carrier to provide separate Primary Rate Interface (PRI) lines or IP connections to each location.

6. XO Enterprise SIP Solution AFTER: XO Enterprise SIP provides high-capacity SIP trunking to one or more primary locations.

8. XO® Enterprise SIP + XO® MPLS IP-VPN For companies that do not have a private network: Enterprises can combine XO Enterprise SIP with XO MPLS IP-VPN for an all-in-one, multi-site IP communications solution Provides a simpler, more cost effective network management structure – all traffic over one network Simplifies with fully-managed solution – XO will configure, deploy, monitor, and manage at each customer site Provides routing intelligence in the networkand allows routing by customer-designated Class of Service options

9. Connect More Locations with XO® XO can provide business-class VoIP services in more markets than other communications services providers XO VoIP footprint covers nearly every state and 2,700 cities nationwide XO Enterprise SIP is ideal for: Retail and restaurants Financial services

10. Substantial Cost Savings Pricing Flexibility Select the TOTAL number of sessions you want to buy for ALL LOCATIONS Pick the port speed that will support total sessions, plus capacity for failover Tailor the pricing with your choice of an XO® Corporate Long Distance Plan Bundle with XO MPLS IP-VPN solution, if needed XO Enterprise SIP provides greatest volume discounts for inbound and outbound calling sessions across your enterprise Solution gives you the flexibility to select the options you want, so you don’t pay for more than you need

11. Business Continuity Features Redundancy Options Failover from one XO® Enterprise SIP connection to another Redundancy inherent in the network Ability to share capacity for calling sessions across the enterprise and burst up to 100% of committed sessions (up to maximum allowed by port speed) Automatic Call Routing Automatically redirects an incoming call to alternate number in event of an unforeseen interruption in service You designate alternate number: mobile, home, PBX main or another dedicated number

12. More Advantages Provides High-Capacity Connections Incremental Bandwidths Ranging from 10 Mbps to 1 Gig Port Speeds available: 10, 20, 40, 60, 100, 200, 300, 500, 1,000 Mbps Allows you to Select Compression Option Uncompressed calls use a codec of G.711 (standard) G.729a also available; compresses the packet size of voice calls, which permits more simultaneous voice calls on the same bandwidth

13. Virtual Telephone Numbers Virtual Telephone Numbers (TNs) give you a presence in markets where you do not physically have an office Useful for organizations that serve many markets from a single office location Virtual TNs are available at additional monthly charge to meet market needs Calls made from Virtual DIDs are billed at local rates Available in all XO® markets within the XO Enterprise SIP network footprint

14. XO® Enterprise SIPInteroperability Interoperability typically with Session Border Controllers (SBC) Acme Sonus Certified IP-PBXs for XO Enterprise SIP (typically larger IP-PBXs) Cisco Unified Communications Manager 5.1, 6.1 and 7.0.1 for use with and without Cisco Unified Border Element (CUBE) Avaya Communication Manager 5.1 and SES 5.1 Nortel CS-1000 Independent Lab Testing for All Others

16. Leverages existing phone systems

17. Maximizes local and long distance savings

18. Shares sessions capacity across Enterprise

19. Leverages private network for free, unlimited site-to-site calling

21. Eliminates hardware and software associated with managing multiple lines

22. Standardizes phone systems

24. Substantial cost savings

25. Options for Business Continuitynetwork redundancy and diversity

26. Modular solution– you choose the options that fit your unique business requirements

27. Quality and Reliability – more than 25,000 businesses nationwide have already deployed XO VoIP solutions

28. Coming Soon –manage your network through an online web interface Why XO® For Enterprise SIP?