24-7PressRelease.com - Next Generation Network solutions Softswitch, Media Gateways for TDM, VoIP, GSM and CDMA (2G,3G), Signaling Gateways (SS7, ISDN, R2, SIP, H323), Broadband Wi-Fi Mobile Routers, Fixed-Mobile Terminals (2G, 3G) and ATC Voice Communication Systems.
Source: www.24-7pressrelease.com

eWeek - Dobrow said that the T-Mobile product uses GSM over IP rather than the more traditional VOIP (voice over IP) that many other products offer. The routers designed to optimize for this will provide priority for voice calls and also let T-Mobile
Source: www.eweek.com

TMCnet - Thus, all you need to provide to your customers is a SIP or H.323 device and let this product do the rest. SOHO Broadband supports both protocols and in fact can transcode between the two if needed. In theory, the product should work with any SIP