... for GSM-VoIP connection, GSM termination & origination, SMS sending & receiving, Quad band 900 1800 850 1900MHz; SIP Asterisk compatible; CDMA VoIP: SC ... Quality、VAD、CNG、AEC、LEC、Packet loss GSM Frequency: Dual band: EGSM 900/DCS 1800 MHZ、Speech Service with EFR (Enhance ... )/FR (Full Rate)/HR(Half Rate) Codec. Tri band: 900/1800/1900MHz, Multi band: 850/1800/1900MHz SC-375: GSM VoIP Terminal ...