Sangoma s300 VOIP Phone with POE (or AC Adapter sold separately) Full duplex speakerphone with acoustic echo cancellation LED for call and message waiting Number of SIP Accounts: 2 Voicemail, paging, music on hold Codecs: iLBC, G.722, G.711 (A/u), GSM_FR, G.723, G.729AB, G.726-32