... networks, the AR2200 can function as an IP PBX or SIP gateway. Specifications: ItemAR2220AR2240HardwareForwarding capacity (64 Byte)1 Mpps2 Mpps (With SRU40 ... server/client, PPPoA client, PPPoEoA client, NAT, Sub interface managementVoiceRTP, SIP, SIP AG, IP PBX/TDM PBX, FXO/FXS, VoIP/conference call3GCDMA ...