Protocol: SIP (RFC3261), IAX2. DTMF: In-band, RFC4733, RFC2833, SIP INFO. SIP Forking. VoIP Trunks: 20. Codec: G711 (alaw/ulaw), G722, G726, G729A, GSM, Speex, ADPCM, iLBC, H263, H263P, H264, MPEG4. IP Services: Static IP, DHCP, VPN, Firewall, VLAN, DDNS, PPPoE, QoS, Static NAT, STUN.
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