4. Technical Parameters
Signalling protocol
SIP (UDP, TCP, TLS)
Buttons
Button design: stainless-steel push buttons
Count of buttons: 1, 3 or 6
Button extension: up to 54 buttons
Numerical keypad: optional
Audio
Volume control: adjustable
Full duplex: Yes (AEC)
Sound pressure level (SPL max): 61.5 dB (for 1 kHz, distance 1 m)
Speech transmission index (STI): 0.88
Audio stream
Protocols: RTP / RTSP
Codecs: G.711, G.729, G.722, L16/16kHz
Camera
Sensor: 1/4'' colour CMOS
Resolution: 640 (H) x 480 (V)
Picture frequency: Up to 30 snaps/s
Sensitivity: 1.9 V/lux-sec (550 nm)
Viewing angle: 55° (H), 39° (V)
Focal length: 3.11 mm
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