- Number of GSM channels (Max): 1- Network type: 850/900/1800/1900MHz - Protocol: SIP (RFC3261),IAX2- Transport Protocol: UDP,TCP,TLS,SRTP- DTMF: RFC2833, SIP INFO, In-band- Codec: G.711A/U law, G.722, G.723.1, G.726, G.729a.- Echo Cancellation: ITU-T G.168 LEC- LAN: 1 (10/100Mbps)- Network: Static IP, DHCP Client, Firewall, VLAN, DDNS, QoS, OpenVPN- NAT Traversal: Static NAT, STUN- Size: 110x70x24mm- Power Supply: AC 100~240V/50~60Hz (DC 12V, 1A) - Operation Range: 0° to 40°C, 32° to 104° F- Storage Range: -20° to 65°C, 4° to 149° F- Humidity: 10-90% non-condensing - SIP Server and SIP Trunk supported- SIP Peer Mode supported- Calling Type: VoIP to GSM, GSM to VoIP- GSM Ports Group Manage, VoIP Trunk Group- Incoming /Outgoing Routing rules- SMS Sending and Receiving- Send Bulk SMS- Gain Adjustment- USSD- PIN Modify- Carrier Selection: Auto/Manual- Balance Alarm- Caller ID/CLIR- Black List- Hotline- Call Duration Limitation- Call Transfer- Call Back- Call Status Display- Call Detail Record (CDR)- Call Progress Tone Generation- Call Duration Limitation for SIM Card/Single Call- LCR (Least Cost Routing)- Top voice quality (EFR super sound)- SIP Response Code Switch- Open API for SMS and USSD- Real Open API Protocol (Based on Asterisk)- IP Blacklist- Network Attack Alert- System Logs