SIP v1 (RFC2543)
SIP v2 (RFC3261)
Voice codec Algorithms:
G.711 :64k bit/s (A-law and µ-law PCM)
G.723.1 :6.3k / 5.3k bit/s
G.726 :16k / 24k / 32k / 40k bit/s (ADPCM)
G.729 :8k bit/s
G.729A :8k bit/s (CS-ACELP)
G.729B :adds VAD
Dynamic Payload
Adjustable Audio Frames Per Packet
Speed Dial Phone
Block Setting
Adjustable Call ID
SLIC PTT Setting
Voice Quality
VAD : Voice activity detection
CNG : Comfortable noise generator
LEC : Line echo canceller
Packet Loss Compensation
Adaptive Jitter Buffer
Call Function
Call Hold
Call Waiting
Call Transfer
Call Forward
Caller ID
3-way conference
DTMF Function
In-Band DTMF
Out-of Band DTMF
SIP Info
Dial Method
Direct IP call without SIP proxy
Dial number via SIP server