... gateway for enterprise networks, the AR2200 can function as an IP PBX or SIP gateway. Specifications: ItemAR2220AR2240HardwareForwarding capacity (64 Byte) ... client, NAT, Sub interface managementVoiceRTP, SIP, SIP AG, IP PBX/TDM PBX, FXO/FXS, VoIP/conference call3GCDMA 2000 EV-DO Rev A ... feel free contact us for more details of huawei and cisco network products. Thank you for your attention. Huawei ...