ZyXEL Communications IES-1248-51 Guía de usuario Pagina 44

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Chapter 1 Introducing the IES-1248-51V
IES-1248-51V User’s Guide
44
Test In/Out
The IES-1248-51V supports the connection of external testing devices. The TEST
IN port is used for testing internal POTS circuits, and the TEST OUT port is used
for testing external wire loop to the customer’s phone.
RTP Statistics
The IES-1248-51V provides the following RTP statistics.
•RTP TX codec
RTP RX codec
RTP TX payload type
RTP RX payload type
RTP local IP/port
•RTP remote IP/port
Echo Cancellation
The device supports G.168, an ITU-T standard for eliminating the echo caused by
the sound of your voice reverberating in the telephone receiver while you talk.
Voice Activity Detection
Voice Activity Detection (VAD) reduces the bandwidth that a call uses by not
transmitting when you are not speaking.
Comfort Noise Generation
Your device generates background noise to fill moments of silence when the other
device in a call stops transmitting because the other party is not speaking (as total
silence could easily be mistaken for a lost connection).
Dynamic Jitter Buffer
The built-in adaptive buffer helps to smooth out the variations in delay (jitter) for
voice traffic. This helps ensure good voice quality for your conversations.
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