Product Name: 32 Ports GSM VoIP Gateway Model Name: GoIP-32Specification:1. 32 SIM cards channel2. Quad band, AutoIMEI changeable3. Support of SMB32 SIM Bank4. VoIP SIP, H323, Remote Access5. Optional SMS termination6. Auto Balance and Recharge Series Model: GoIP-1, GoIP-4, GoIP-8, GoIP-16, GoIP-32 (external antenna series) ..