D-Link DPH-120SE User Manual page 80

 G.722
 G.726
 Codec Setting per SIP line
 Echo cancellation: G.168 Compliance in LEC, additional acoustic
echo cancellation(AEC) can reach 96ms max filter length in
hands-free mode
 Supports Voice Gain Setting, VAD, CNG
 Full duplex hands-free
 Multi line
 HD Voice
 SIP support
 SIP domain
 SIP authentication
 none
 basic
 MD5
 DNS
 Peer to Peer/ IP call
 Automatic line selection
 9 Standard ring tones and 3 user-defined ring tones
 DTMF
 SIP info
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