4. Technical Parameters
Signalling protocol
SIP (UDP, TCP, TLS)
Buttons
Button design: Transparent, white backlit buttons with easily replaceable name
tags
Count of buttons: 1, 2 or 4
Numerical keypad: optional
Audio
Microphone: 2 integrated microphones
Amplifier: 10 W (class D)
Loudspeaker: 1 W (optionally 10 W)
Sound pressure level (SPL max): 78.5 dB (1 W type, for 1 kHz, distance 1 m)
Sound pressure level (SPL max): 94 dB (10 W type, for 1 kHz, distance 1 m)
Volume control: Adjustable with automatic adaptive mode
Full duplex: Yes (AEC)
Speech transmission index (STI): 0.80
Audio stream
Protocols: RTP / RTSP
Codecs: G.711, G.729, G.722, L16/16kHz
Camera SD
Sensor: 1/4'' colour CMOS
Resolution: 640 (H) × 480 (V)
Frame rate: Up to 30 snaps/s
Sensor sensitivity: 1.9 V/lux-sec (550 nm)
View angle: 135° (H), 109° (V)
Infrared light: Yes
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