AT&T Mobility Network Optimization Michael Van Weelden Director – SCM – AT&T Mobility July 14, 2007

Ntwk Opt AT&T Proprietary (Restricted) authorized individuals only 2 LEC MTSO SWC LEC/CLEC LSO Mobility Switch M13 OC/DS3 Channel Termination OC/DS3 Channel Mileage LEC MTSO SWC LEC/CLEC LSO Mobility Switch M13 AT&T Mobility Network Optimization Architecture Example OC/DS3 Channel Termination AT&T Mobility Leased/Owned Ring Service Cell Site DS1/DS3 Channel Termination Cell Site

Ntwk Opt AT&T Proprietary (Restricted) authorized individuals only 3 Mobility Network Optimization Process Flow – Planning, Capacity Analysis, Implementation, and Tracking Bill Tamer and Granite inventory information Preliminary plan and capital estimate used for pricing Deliver price Capacity analysis and capital cost Facility assignment information New service tracking data Preliminary opportunity Data for optimization analysis Program Mgmt Develop financial impact Manage Mobility relationship Provisioning Place new Local PL service orders Issue disconnects Program management of vendor and Mobility resources Provisioning Provision new PL service NP&E Capacity availability Augment capital estimate Access Suppliers Place orders for new service Issue Disconnect disconnect tracking data Network Eng’g Finalize design Finalize schedule Coordinate service A A Issue PL Order Coordinate w/ Network Engineering Tracking Track new service Access Suppliers Data for optimization analysis Billing data Manage data sources Program Mgmt Review target plan Work w/ NP&E on capacity requirements Term Liability impacts PLANNING CAPACITY ANALYSIS IMPLEMENTATION Planning LATA data scrubbing LATA analysis Align Mobility leased assets w/ ATT Develop proposed Architecture Network Eng’g Joint planning

Ntwk Opt AT&T Proprietary (Restricted) authorized individuals only 4 Network Optimization Objectives Reduce Mobility Transport Expense Secure high quality, reliable transport services Promote redundancy/survivability in “core” network Maximize circuit utilization Optimize internal and external resources Anticipate future capacity requirements AT&T Mobility Network Optimization