Yeastar TG400 will help save costs by using the optimal call routing feature and the Call Back function, creating a backup channel in case of failure of the landline telephony or for calling the office in hard-to-reach places. Capabilities: - 4 GSM lines 850/900/1800/1900 MHz - Built-in SIP proxy for IP phones - Incoming call routing - Outgoing call routing - Optimal route selection (LCR) - Grouping of SIP trunks and GSM lines - USSD requests - Sending and receiving SMS (via web interface) - Bulk SMS sending - Open API for USSD requests and SMS (Real Open API Protocol (Based on Asterisk)) - Anti-CLI (CLIR – Calling Line Identification Restriction) - Call Back function - Low balance notification - Echo cancellation ITU-T G.168 LEC - Hot-swappable SIM cards Network characteristics: - Protocol: SIP (RFC3261), IAX2 - Transport: UDP, TCP, TLS - DTMF: RFC 2833, SIP INFO, In-band - Codecs: G.711A/U-law, G.722, G.726, G.729a, GSM, ADPCM, Speex - VLAN, firewall, OpenVPN - SIP response code switch capability Physical characteristics: - 1 LAN port (10/100 Mbps) - 4 GSM lines 850/900/1800/1900 MHz - External antenna installation capability - Size: 213x160x44 mm - Power supply: AC 100-240V 50/60Hz 1.5A max - Operating temperature: from 0°C to 40°C Package contents: - Yeastar TG400 – 1 pc. - Rack mount – 3 pcs. - Screws – 9 pcs. - Grounding nut – 1 pc. - Rubber feet – 4 pcs. - Power cable – 1 pc. - Network cable (patch cord) – 1 pc. - Antenna – 4 pcs. - Warranty card – 1 pc. - Installation manual – 1 pc. - Quick user guide – 1 pc.