Ideal for small offices and businesses with fewer than 32 users, MyPBX SOHO is an affordable, yet fully-featured embedded hybrid IP PBX with ISDN BRI and PSTN connectivity, providing a cost-effective solution for your business. Users: 32 Concurrent Calls(Max): 15 Voicemail: 3000min Interface: Up to 4 Analog Ports (FXO/FXS) Up to 4 BRI Ports LAN: 1 (10/100Mbps) Size: 193x153x30 mm Weight: 500g Power Supply: AC 100~240V/50~60Hz (DC 12V, 1A) Protocol: SIP(RFC3261), IAX2 Transport Protocol: UDP, TCP, TLS, SRTP Codec: G.711, GSM, SPEEX, G.722, G.726, ADPCM, G.729 A, H261, H263, H263p, H264, MPEG4. DTMF: Inband, RFC2833, SIP INFO Echo Cancellation: Supported LED: Red for FXO, Orange for BRI, Green for FXS. Network: Firewall, VLAN, DDNS, QoS, DHCP Server Multiple Languages Support: Chinese, Dutch, English, French, German, Hebrew, Korean, Italian, Polish, Portuguese, Romanian, Russian, Spanish, Thai, Turkish