PACW PacWest Bancorp

Pac-West Telecomm Enhances VoiceSource Offering to Support IP Connectivity Enables VoIP and other IP providers to use Pac-West as a bridge to connect to the PSTN STOCKTON, Calif., June 6 /PRNewswire-FirstCall/ -- Pac-West Telecomm, Inc. (NASDAQ:PACW), a provider of traditional and next-generation voice communications services in the Western U.S., today announced that it has enhanced its VoiceSource offering to support IP (Internet Protocol) connectivity for origination and termination of voice traffic. The enhancement enables next-generation service providers to use Pac-West's SuperPOP network as a bridge to interconnect IP networks with the public switched telephone network (PSTN). Hank Carabelli, Pac-West's President and CEO, said, "VoiceSource leverages our unique network infrastructure to bridge IP networks with the PSTN fueling the growth in VoIP and other IP-based voice services. Offering service providers the ability to connect to our network via IP enables our customers to rapidly and cost-effectively deploy next-generation services throughout our Western U.S. footprint, including virtually 100% of California." Using an IP handoff, next-generation service providers can quickly and seamlessly interconnect their IP networks to the PSTN through Pac-West's SuperPOP network without having to invest in additional equipment to convert their IP traffic to traditional TDM protocols. This significantly reduces the service provider's costs and accelerates time to market. Infonetics Research analyst Kevin Mitchell agrees with the cost and infrastructure benefits, stating, "In the recent past, handoffs between carriers had to be TDM, even if both carriers transported VoIP. Now gateways can be eliminated, reducing stranded capex and opex associated with back-to- back gateways." Mitchell goes on to report that carrier respondents are planning more native VoIP interconnects. "In our study on carrier VoIP adoption 'Service Provider Plans for Next Gen Voice 2004,' when we asked carrier respondents what percentage of their outgoing (terminating) voice traffic to other carriers is native VoIP, both at the time of the interview and 12 months into the future, respondents reported that terminating traffic was an average of 2% native VoIP in 2004, jumping to an average of 13% in 2005." To transport IP-based voice traffic, Pac-West recently augmented its network to support multiple signaling protocols, including SIP (Session Initiation Protocol). Michael Hawn, Pac-West's Vice President for Customer Network Services, noted, "With SIP becoming the dominant signaling protocol for IP voice transport, we have recently implemented it across our network to meet customer demand." About VoiceSource Pac-West's VoiceSource offers service providers, including VoIP providers, a single source for the three key components required to deliver IP-based local phone service. The VoiceSource suite includes PSTN On Ramp, Network Database Services (NDS), and Driver's Seat. PSTN On Ramp includes origination and termination, local access numbers, two-way connectivity, foreign exchange, and 911 call routing throughout Pac-West's footprint. NDS enables customers to update end-user information in industry telephone databases, including E911. Driver's Seat, Pac-West's secure Web portal, enables customers to manage their VoiceSource account online, including ordering local access numbers, activating end-users, and viewing billing and call detail records. For more information on VoiceSource, please visit http://www.pacwest.com/voicesource. About Pac-West Telecomm, Inc. Founded in 1980 and first incorporated in 1981, Pac-West Telecomm, Inc. has been offering telephone service to its customers since 1982. Pac-West's network averages over 120 million minutes of voice and data traffic per day, and carries an estimated 20% of the dial-up Internet traffic in California. In addition to California, Pac-West has operations in Nevada, Washington, Arizona, and Oregon. For more information, please visit Pac-West's website at http://www.pacwest.com/. Forward-Looking Statements In this press release, our use of the words "outlook," "expect," "anticipate," "estimate," "forecast," "project," "likely," "objective," "plan," "designed," "goal," "target," and similar expressions is intended to identify forward-looking statements. While these statements represent our current judgment on what the future may hold, and we believe these judgments are reasonable, actual results may differ materially due to numerous important risk factors that are described in our Annual Report on Form 10-K for the period ended December 31, 2004, as filed with the SEC on March 30, 2005, which may be revised or supplemented in subsequent reports filed by us with the SEC. Such risk factors include, but are not limited to: our level of indebtedness; an inability to generate sufficient cash to service our indebtedness; regulatory and legal uncertainty with respect to intercarrier compensation payments received by us; the inability to expand our business as a result of the unavailability of funds to do so; the migration to broadband Internet access affecting dial-up Internet access; the loss of key executive officers could negatively impact our business prospects; an increase in our network expenses which could result if the migration of our enterprise customer base to U.S. TelePacific Corp. occurs sooner or later than contemplated; and our principal competitors for local services and potential additional competitors have advantages that may adversely affect our ability to compete with them. DATASOURCE: Pac-West Telecomm, Inc. CONTACT: Investors: Reid Cox of Pac-West Telecomm, Inc., +1-209-926-3417 or Web site: http://www.pacwest.com/

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