AT&T Voice Over IP Connect Service (“AVOICS”) This is a typical Title slide, without image. If a picture needs to be inserted, go to….

Outline Service Description (Summary) Supported Call Types AVOICS Connectivity Options Service Elements Network Architecture Pricing Structure Overview Customer Responsibilities Customer Care & Billing The AT&T Value Next Steps

AT&T Voice Over IP Connect Service (“AVOICS”) Summary Service Description The AT&T Voice Over IP Connect Service (“AVOICS”) is offered to Service Providers, based in the continental US, who require the establishment of voice over internet protocol (“VOIP”)-based connectivity for long distance call termination. AVOICS Is built on AT&T’s VoIP Network Infrastructure “VNI” MPLS-enabled (Multi-Protocol Label Switching) SIP – Based VoIP Platform

AVOICS Service Overview Supported Call Types Domestic - 1+ Outbound and International Outbound AVOICS accepts U.S.-originated domestic outbound (1+) calls and U.S.-originated international outbound (011+) originated calls. “U.S.-originated” refers to calls originated from all NPAs within the continental United States, Alaska, Hawaii, Guam, The Commonwealth of the Northern Mariana Islands, Puerto Rico and the U.S. Virgin Islands. Unbranded Directory Assistance AVOICS will also provide unbranded directory assistance (NPA-555-1212) for the Domestic US, Canada and Puerto Rico. Customer hands all traffic to AVOICS in IP - Native (IP) Origination: Call originates from the consuming user as IP - Non-Native (TDM) Origination: Call originates from the consuming user as TDM and is then converted by the Wholesale Customer to IP

Public IP Peering Point AVOICS 5 4 AT&T VNI MIS-PNT End-User 3rd Party ISP CBB PSTN Customer’s Network NGBEs IPBEs AVOICS MIS SBC AR (MIS) PE (PNT) OSR Public IP Peering Point IGR Common Back Bone VoIP Network Infrastructure Connectivity Options Network Architecture Dedicated MIS/MPLS-PNT Connectivity between Customer Router and AT&T T1 through OC48 Ethernet Transport Independent Access (TIA) (Available Mid June , 2009) MIS - Shared facility available to support AVOICS Public Peering Point - Internet Gateway Router- IGR   Service Elements SIP Signaling Compression (CODEC call by call) - G.711, G726, G.729 A/B T.38 Fax over IP Connectivity between IP Voice Network and TDM PSTN Domestic and International Termination of LD Traffic

AVOICS - Pricing Structure Overview VoIP Calls - Usage Elements Domestic Domestic Transport Usage rate (per MOU) Domestic Termination Rate File by State/LATA/OCN (per MOU Timing is initial 18 seconds, and each additional 6 seconds International International Rates are Bundled (Transport and Terminating access - per MOU) - Timing is initial 18 seconds, and each additional 6 seconds For Mexico and all AT&T Commercial Satellite and AT&T Maritime Mobile Service, there is one minute timing. IP Connectivity and Facilities Dedicated Facilities MIS-PNT AT&T MIS PNT Service, with associated pricing elements (local channel charges, MIS PNT Port), are ordered and priced under a separate agreement. Transport Independent Access MIS AT&T MIS, with associated pricing elements are ordered and priced under a separate agreement. Public IP Peering Gateway/Point There are no specific charges associated with this access method

AVOICS - Customer Responsibilities Manage & Hosts the End User VoIP Application Manage & Hosts Gateways & Soft Switch’s for call processing Manage CLEC Functions - Provide Local Number assignments, CALEA, Directory listings, - e911, N11, … - End User Customer Premise Equipment (CPE), Brand service as your own Manage all end user customer care and billing Monitor / forecast network needs Use applicable ordering and maintenance processes / systems Provide footprint for current & planned service areas Responsible for all fraud claims

AVOICS - Customer Care and Billing Ordering Initial Design, Interoperability Testing (IOT) Technical Due Diligence (TDD) and Contracting Via AVOICS Sales and Technical Support Team AVOICS Customer Care End to End Project Management Maintenance Toll Free Number 24/7 – 365 Trouble Ticketing process Billing Monthly summary invoices Daily, weekly or monthly CDRs CDR – Call Detail Record Layout EMI – Exchange Message Interface format (Based on Industry Standardization) Media Type(s) CD Rom Electronic Daily Feed CDR=[Date],[Time],[CPN],[Dialed Number],[Duration]

Customer Value -The Power of the AT&T Network AT&T’s AVOICS Customer Value -The Power of the AT&T Network AT&T’s networking infrastructure operates at 99.999% reliability MPLS for stability and class of service Scalable capacity and best practices AT&T global MPLS network provides inherent network security. Superior Customer Experience Multilayer support structure Get service when and the way you ‘expect’ it Availability & Reliability Security Service

Next Steps Meet The AVOICS Sales Support Team AT&T Wholesale Account Team AVOICS Sales Overlay Specialists AT&T Technical Support Team Schedule the AVOICS Interoperability Test (IOT) Plan and Complete SIP Profile Work Through the AVOICS Technical Due Diligence (TDD) Receive The AVOICS Customer and Technical Guide Review the AVOICS Service Description and Pricing Arrangements Start the contracting process

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