D-Link DPH-120SE User Manual page 81

 DTMFIn-Band
 RFC2833
 AUTO
 SIP applications
 Call Forward
 Call Transfer（Blind/Attended）
 Hold
 Call Waiting
 3 Way Conference
 SMS
 Remote Pickup
 Join Call
 Redial
 Unredial
 Multi-line
 Intercom
 Push to talk
 Auto Redial
 Call Back
 Call control features
 Flexible dial plan
 Hotline
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