- Support 2.0 (RFC3261) and correlative RFCs
- Support IAX2
- Support 2 SIP lines
- Codec:G.711A/u, G.723.1 high/low,G.729 a/b, G.722.1,G.726
- Support HD voice 2 line keys defined as multi-line with screen display, or used as SIP line keys
- Soft keys programmable
- Hard function key reprogrammable
- SIP application:support call forward/transfer(blind/attended)/holding/ waiting/3 way talking/conference/pickup/join call/redial and unredial/click to dial
- Support SRTP
- Support BLF
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