1. Microsoft ® Lync On-Line ™ SIP Trunking in the Cloud

2. Agenda ▪What is SIP Trunking? ▪SIP Trunking Benefits ▪SIP Trunking Deployment Scenarios with Lync On-Line ▪Qualified SIP Trunking Partners

3. SIP Trunking Overview ▪SIP Trunking enables an enterprise to communicate with internal and external users over IP, including calls to traditional PSTN networks. ▪Utilizing the SIP protocol provides a platform for future delivery of other real time communication modalities. SB C Lync Server Central Site Lync Endpoints Lync Servers Service Provider Core Network Service Provider MPLS Network Cloud Provider DMZ SIP Trunk

4. SIP Trunking Enables- Aggregation of Trunks ▪Combine all voice trunks from many office sites into the cloud data centers ▪Leverage Certified Providers integration to the cloud data center for Telephony and Conferencing ▪Quickly add capacity and services on demand (ex. Conferencing) Aggregation of Access ▪Reduced number of facilities required ▪No fixed capacity or location requirements ▪Less HW to purchase, maintain, and operate On-Net Calling ▪Make free calls with users in the same service provider network

5. SIP Trunking Benefits Cost Saving Save telecommunication costs from replacing expensive circuits with cheaper trunks Save management cost in customer premise equipment Optimize communications spending by managing usage per consumption Technology Efficiency Design network and manage capacity with flexibility Streamline IT administration with network consolidation and management flexibility Future Extensibility Multimedia and value add service stream thru SIP Trunk

6. Architecture Lync Pool A/V MCU SBC Partner Infrastructure SP/ACP Partner Microsoft Online Partners offer audio conference bridge services and PSTN connectivity to join external participants Lync GTM, Billing, Provisioning requirements fulfilled by syndication partner Dedicated SIP Trunk interconnects Microsoft Data Center with partner’s Data Center Lync Server 2010 provides the capabilities that are added by the partner for Lync Online. Mediation Server ACP MCU Edge Server (ACP/MR) Access Module Dedicated SIP Trunk

7. PSTN Voice w/ SIP Trunking

8. Lync Online Dedicated Qualified SIP Trunking PartnersSIP Trunking Partners CarrierService Name AT&TAT&T IP Flexible Reach Service BT Global ServicesBT Onevoice Global CrossingSIP Trunking Services IntelePeerIntelePeer SIP Trunking InterouteInterouteOne Level 3Level 3 Communications SIP Trunking TDCTDC Business Trunk Verizon BusinessIP Trunking Services *Dedicated qualification is additive to basic Lync product SIP trunking qualification