What is UniRoam?

2. What is UniRoam? • Bi-directional interoperability between ANSI-41/GSM and ANSI-41/PDC • Allows international roamers to make and receive calls using their home wireless number • Enables calls to appear on subscriber’s regular monthly bill TSI Proprietary and Confidential

3. UniRoamSM Benefits • Supports both GSM and ANSI-41participation • Operators choose their sponsor operator • Operators clear directly with each other via TSI • Technical foundation for features such as voicemail and short message service • Optional End User Customer Service • Supports Rev. A, B and C Call Processor customers TSI Proprietary and Confidential

4. UniRoamSM Architecture Roaming Partner Direct Roaming Agreement Sponsor Operator Home Operator Roaming Partner Roaming Partner Technical Business Relationship continue TSI Proprietary and Confidential

5. Call Scenarios ANSI-41 GSM continue TSI Proprietary and Confidential

6. ANSI-41 Subscriber in GSM Market Registration Outbound Call Inbound Call How the Charges Are Billed back continue TSI Proprietary and Confidential

7. TSI Sponsor Operator VLR ANSI-41 Registration HLR TSI Proprietary and Confidential

8. TSI translates the response into the appropriate GSM messages and forwards it to the the sponsor operator. TSI converts the message into an ANSI-41 message and forwards the “Registration Notification” to the home operator. The serving market recognizes the routing information as the sponsor operator and forwards the registration to the sponsor operator’s network. The sponsor operator recognizes this as a subscriber of the home operator, and forwards the “Update Location” GSM message to TSI The home operator sends a response (validation) to TSI. The sponsor operator forwards these messages on to the serving operator. UniRoamSM subscriber powers on the phone in the true serving market TSI Sponsor Operator VLR VLR VLR ANSI-41 Registration The subscriber can now make calls. HLR TSI Proprietary and Confidential

9. TSI Sponsor Operator VLR ANSI-41 Registration HLR return to scenarios TSI Proprietary and Confidential

10. ANSI-41 Outbound Call Destination of Dialed number Serving Market TSI Proprietary and Confidential

11. Serving operator delivers the call to the dialed number Call goes to the network of the true serving operator ANSI-41Subscriber W/GSM handset ANSI-41 Outbound Call Mobile customer dials the number they wish to call Destination of Dialed number Serving Market TSI Proprietary and Confidential

12. ANSI-41 Outbound Call Destination of Dialed number Serving Market return to scenarios TSI Proprietary and Confidential

13. TSI Sponsor Operator HLR VLR ANSI-41 Inbound Call TSI Proprietary and Confidential

14. TSI translates the message into an ANSI-41 message with a TLDN and sends the TLDN to the home, which uses that TLDN to deliver the call. The home switch sends a “Call Route Request” to TSI to obtain a TLDN (Temporary Local Directory Number). TSI translates the message into a “GSM Provide Roaming Number” message and forwards the request to the sponsor operator Caller dials the home wireless number of the ANSI-41 subscriber. Call is connected from the home network to the caller in the serving market. The sponsor operator forwards the request to the true serving market. Sponsor operator forwards the Roaming Number to TSI Serving operator (VLR) returns a Roaming Number TSI Sponsor Operator HLR VLR ANSI-41 Inbound Call TSI Proprietary and Confidential

15. TSI Sponsor Operator HLR VLR ANSI-41 Inbound Call return to scenarios TSI Proprietary and Confidential

16. TSI Sponsor Operator HLR VLR How the Charges Are Billed (ANSI-41) TSI Proprietary and Confidential

17. Serve operator forwards call records in TAP to sponsor operator, which “looks” like the roamer’s home operator. Sponsor operator sends the call records to TSI’s clearinghouse. Sponsor operator now “looks” like the serve. The CIBER records are sent to the home operator to bill its subscribers TSI Sponsor Operator HLR VLR How the Charges Are Billed (ANSI-41) TSI converts the TAP records to CIBER, inserting the subscriber’s home information TSI Proprietary and Confidential

18. TSI Sponsor Operator HLR VLR How the Charges Are Billed (ANSI-41) return to scenarios TSI Proprietary and Confidential

19. GSM Subscriber in ANSI-41 Market Registration Outbound Call Inbound Call How the Charges Are Billed back continue TSI Proprietary and Confidential

20. TSI VLR HLR GSM Registration TSI Proprietary and Confidential

21. TSI converts the message into a “GSM Update Location” and forwards the message to the home operator. TSI translates the responses into an ANSI-41 return result message and forwards it to the serving operator. The serving market forwards the registration notification to TSI based on the NPA/NXX. The home operator returns the appropriate responses (validation) to TSI. TSI VLR HLR GSM Registration The subscriber can now make calls. GSM subscriber powers on the ANSI-41 phone in the true serving market TSI Proprietary and Confidential

22. TSI VLR HLR GSM Registration return to scenarios TSI Proprietary and Confidential

23. GSM Outbound Call Serving Market Destination of Dialed number TSI Proprietary and Confidential

24. Serving carrier delivers the call to the destination of the dialed number Call goes to the network of the true serving operator GSM Subscriber with ANSI-41 handset GSM Outbound Call Mobile customer dials the number they wish to call Serving Market Destination of Dialed number TSI Proprietary and Confidential

25. GSM Outbound Call Serving Market Destination of Dialed number return to scenarios TSI Proprietary and Confidential

26. TSI VLR HLR GSM Inbound Call TSI Proprietary and Confidential

27. TSI translates the message into ANSI-41 and forwards the request for TLDN to the serving market TSI translates into a GSM message with a roaming number and sends the roaming number to the home, which uses that number to deliver the call. The home switch sends a “provide roaming number” message to TSI to obtain a roaming number Call is connected from the home network to the caller in the serving market. Caller dials the home wireless number of the GSM subscriber. Serving operator (VLR) returns a TLDN to TSI TSI VLR HLR GSM Inbound Call TSI Proprietary and Confidential

28. TSI VLR HLR GSM Inbound Call return to scenarios TSI Proprietary and Confidential

29. Data Clearing- house TSI VLR HLR How the Charges Are Billed (GSM) TSI Proprietary and Confidential

30. Serve operator forwards call records in CIBER to TSI Data clearinghouse of the home operator sends TAP file to home operator The TAP file is sent to the data clearinghouse of the home operator Data Clearing- house TSI VLR How the Charges Are Billed (GSM) If customer was roaming off the sponsor operator’s network, TSI clears as normal and provides settlement reports for sponsor operator TSI converts the records to TAP, inserting the subscriber’s home information HLR TSI Proprietary and Confidential

31. Data Clearing- house TSI VLR HLR How the Charges Are Billed (GSM) return to scenarios TSI Proprietary and Confidential

32. Requirements • Network Connectivity to TSI • Handsets • Activation Process • UniRoam Contract • Roaming agreement with a Sponsor Operator • Billing Identifier (i.e. BID, PMN) • Clearing and Settlement • Customer Service TSI Proprietary and Confidential

33. End-to-End Solution Customer Service Network Standards Translation and Conversion TSI Proprietary and Confidential