OpenVox VS-GW1202-4W Desktop 3G Gateway 1202, 4 WCDMA Channels 4/8 3G/UMTS Channels Affordable Price with Superior Performance Hot-swap Design for both Sim cards and Modules Compatible with Asterisk, Elastix, 3CX, FreeSWITCH Sip Server and VOS VoIP operating platform Available for OEM One Year Warranty