Yealink SIP-T28P Enterprise IP TelephoneNetwork Features SIP 2. 0(RFC3261) protocol, NAT traversal: STUN mode IP assignment: DHCP Static IP PPPoE Auto provision: firmware, configuration, ringtone, phonebook etc. QoS: IEEE 802. 1p q tagging (VLAN), Layer 3 ToS In band DTMF, Out band DTMF and SIP INFO DTMF Proxy mode and peer to peer SIP link mode Standard encryption and authentication(MD5 and MD5 sess) Phone Features Support up to 6 SIP accounts, Hotline, Emergency call Call hold, Call
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