69 VoIP Subscriber Gateways
G.711U NSE–CISCO NSE support, G.711U codec is used to transfer data via modem
connection.
The chosen codec should be active in voice codecs list too.
- Payload type for RFC2833 packets - payload type for packets transmission via RFC2833
(permitted values: 96 to 127);
- Use the same PT both for transmission and reception – when checked, use the same
type of payload for transmission and reception;
- Silencedetector – when checked, use silence detector otherwise do not use it;
- Echocanceller – when checked, use echo canceller otherwise do not use it;
- RTCP - when checked use RTCP for voice channel control: The following parameters are
available for editing:
Sending interval – interval of message transmission via RTCP protocol, in seconds;
Receiving period – RTCP packet receiving period. Assigned in the units of
transmission period. The device breaks connection if no one packet will be received
via RTCP protocol from the opposite site during the receiving period;
- Dumb pass-thru:
VBD codec – codec selection (G.711A or G.711U) to transmit data in voice channel;
Payload type – payload type of voice channel data transmission (acceptable values
for use are 0, 8, and the range from 96 to 127). Setting is used for modem data
transmission when codec and payload type of RTP opposite side are changed
during transition to modem.
Jitter Buffer compensates jitter effect. Received packets on the reception side will be not
reproduced immediately, they will be reproduced with the delay which is unnoticed by man. But this
delay allows you to improve quality of voice transmission in case of jitter.
- Adaptive Jitter Buffer – when checked, buffer size will change from minimum to
maximum automatically. Otherwise, buffer size will be fixed and equal to maximum size
of adaptive jitter buffer;
- Soft Deletion Mode – when checked, to improve the quality of voice transmission the
packets are not dropped immediately when they achieve maximum value of jitter
buffer. They will be dropped in the period of deletion threshold expiration. Otherwise
the packets will be deleted immediately after achieving max value of jitter buffer;
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