1/5/2007
EAG Gateway Series Administration Guidelines
MAG-06007 Rev. A
NAT information.
VAD Activate
Setup whether to use comfort noise generation technology to simulate background noise from the
origination side. Default value is: Yes.
Suggestion:
Set this parameter to “Yes” in order to save network bandwidth.
․
Yes:
The speech packet will not be sent out when caller is in silence. Noise is added to the
speech stream to replace the silence.
․
No:
The speech packet will be sent out even when caller is in silence.
G.723.1
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Rate
Setup G.723.1 encoding rate. Default value is: 5300. Possible selections are:
․
5300:
5.3kbps.
․
6300:
6.3kbps.
IP TOS
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Setup the priority for different classes of service. Default value is 0. For example, TOS=0xB8 means
the priority is 5, requiring lower delay and higher throughput while concerns less about reliability.
T.38
T.38
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Set whether to invoke T.38 fax functionality. Default value is: Off.
․
On:
Enable
․
Off:
Disable
T.38 Packet Time (ms)
Set the packaging interval for each T.38 data frame. Default value is: 30. The valid rate range is: 10 ~
60.
T.38 Redundancy
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Set the number of the redundancy frames in each T.38 data package. Default value is: 4. The valid
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G.723.1 dual-rate speech coder performs compression and decompression of 8 kHz speech signals. It encodes
16-bit PCM samples into 16-bit code-words yielding 10 or 12 code-words per 240 sample frames for the 5.3
Kbps and 6.3 Kbps channels respectively. 60% of a phone call consists of silence. Silence Compression
Scheme and Voice Activity Detection (VAD) reduce network bandwidth usage and save valuable speech
resources.
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TOS (Type of Service) has 8 bits reserved to the service type in the IP datagram. 0-2 means precedence. 6-7
are unused. 3-5 means D (requests low delay), T (requests high throughput), R (requests high reliability),
respectively.
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T.38 is an ITU-T Recommendation. T.38 describes the technical features necessary to transfer facsimile
documents in real-time between two standard Group 3 facsimile terminals over the Internet or other networks
using IP protocols. The Recommendation allows the use of either TCP or UDP depending on the service
environment
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Redundancy frame is used to ensure more reliable fax transmissions than that of RTP voice transmission.
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