2. LTE roaming – a whole new world

3. Acme Packet 3 Session Border Control (SBC) category creator and leader with over 60% market share Mission: enable delivery of trusted, first-class interactive communications and data services across IP network borders 10,000+ systems in over 100+ countries 850+ service provider customers 240+ enterprise & contact center customers 100+ distribution & integration partners Experienced, long-standing leadership team Public company with strong financials Founded: 2000 HQ: Bedford, MA USA NASDAQ: APKT 2010 revenue: $231.2M 2010 net income: $43M 575+ employees AT&T Acme Packet at a glance

4. Acme Packet All services IMS/SIP services Data services Diameter Mobility tracking 4G LTE/M-WiMAX eUTRAN EPC PCRF S-GW MME Internet Other IP networks P-GW IMS eUTRAN EPS RAN Core 2001- 2010 NGN 3G SS7 over IP (BICC/ SIGTRAN) 2011- Diameter & SIP over IP IMS LTE 1990- 2000 SS7 over TDM PSTN 2G The all IP Future

5. Acme Packet 1.Attachment procedure 2.Authentication procedure 3.Update location procedure 4.Subscriber data retrieval procedure 5.Policy exchange Home network 1 Attach 2 Authenticate 2 3 Visited network HSS MME Roaming border Authenticate Update Location 4 Subscriber Data 5 Policy exchange PCRF LTE roaming overview

6. Acme Packet Visited MNO MME HSS Home MNO Visited MNO PCRF Home MNO PCRF S6a Diameter (3GPP TS 23.401) –AAA interface between visited MME and home HSS –Transfers subscription, location and authentication data for authenticating user access to visited EPS S9 Diameter interface (TS 23.203) –Policy interface between the Home PCRF and Visited PCRF –Transfers QoS policy and charging control information Diameter is the key roaming protocol

7. Acme Packet 7 Home network Visited network eUTRAN Home Routed PCRF eUTRAN H-PCRF V-PCRF Distributed Policy Control eUTRAN PCRF Visited P-CSCF eUTRAN PCRF Visited Services Home routed with data backhaul to home network (existing data model) Distributed policy control with policy interfaces Visited P-CSCF with policy control in visited network (selected by GSMA IR.92) Visited services with IMS core in visited network VoLTE roaming options

8. Acme Packet 3GLTE SwitchingCircuitPacket Voice bearerTDM voicePacket voice Roaming signaling (policy exchange) SS7Diameter Subscriber dataHLRHSS QoS elementn/aPCRF LTE roaming is all IP

9. Acme Packet Service provider BService provider A Interoperability Security risk Scalability Network complexity & cost Roaming challenges

10. Acme Packet DoS protection Comprehensive L3-L5 interworking Intelligent routing Accounting/recording Roaming network requirements