... calling...... Detailed Product Description1. Key Industry Standards SupportSIP Proxy/Register/Application ServerRFC3261 (RFC3262, 3263, 3265, 3325, 3515, 3581, 3891, 2976, 3326 ... : H.263, H.264, Mpeg4 [Pass Through]VPN: PPTP/L2TP Server,Open VPN ClientEnum (RFC2916,3761, 3764)PPPoE (RFC2516)Dynamic DNS ...