• 4-Ways analog outline jack.
• DSP double- channels assignment , each way of PSTN
• DSP double- channels assignment , each way of PSTN supports three-way calling.
• Support voice coding: G.722 ( Wide band 16KHz/16bit)
G.711 (narrow band 8KHz/8bit )
• Support DTMF standard: RFC2833.SIP.Info,Info,In-band.
