User manual

Rainbow2 IP Phone User Manual
ATCOM TECHNOLOGY CO., LIMITED www.atcom.cn
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4.5.4 Voice
Echo Cancellation
1. VAD：Whether to enable VAD(Voice Active Detection). If enable, RTP packets will not be send
when Rainbow2 is mute.
2. CNG：Whether to enable CNG(Comfort Noise Generator). If enable, comfort noise will be send
to the far end to let it perceive the activity of the conversation when Rainbow2 is mute.
Jitter Buffer
Rainbow2 can buffer incoming voice packets to minimize out-of-order packet arrival. This process is
known as jitter buffer.
1. Type: Choose type of jitter buffer. When choose Fixed, the size jitter buffer is fixed. When
choose Adaptive, the size of jitter buffer is the sum of Min Delay and the size of RTP packets.
2. Min Delay: The minimum delay of the jitter buffer.
3. Max Delay: The maximum delay of the jitter buffer.
4. Normal Delay: It is used for fixed jitter buffer which should be between Min Delay and Max
Delay.
4.5.5 Ring
Administer can upload 2 user define ring for Rainbow2. The ring file should be wav(8k, 8bit, u-law)
and no larger than 200 KBytes.