Medias Mediatrix 1204, Справочное руководство

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Detecting a Far End Disconnect Reference Manual (SIP Version)
Mediatrix 1204 191
If the silence detection feature does not work well on your SCN/PBX, try another encoder (G.723.1A,
G.729AB, G.726 with VAD, or G.711 with VAD). With G.711 and G.726, try to increase the aggressiveness of
the silence detection (see
“Voice Activity Detection” on page 210 for more details). You can also try to lower
the time needed to declare a silence period.
X
To enable the silence detection feature:
1. Set the fxoFeocOnSilenceDetectionMode variable with one of the following options:
Table 116: Silence Process vs Codec
Codec Description
G.711 (A-law and µ-law) When VAD is enabled and this codec encounters silence, it sends RTP packets
(payload 13) that can be detected.
G.723.1 When this codec encounters silence, it sends SID (Silence IDentification)
packets that can be detected.
G.726 When VAD is enabled and this codec encounters silence, it sends RTP packets
(payload 13) that can be detected.
G.729 When this codec encounters silence, it sends SID (Silence IDentification)
packets that can be detected.
Table 117: Silence Detection Options
Silence Detection Option Description
Disconnect the line if silence is detected
on the communication from the IP side
to the SCN side. Set the fxoFeocOnSilenceDetectionMode variable to
onIpSilent and:
• With the G.711 and G.726 codecs,
activate the VAD feature of the remote IP
device. The Mediatrix 1204 interprets lack
of incoming packets as a period of silence
and activates the silence detection
feature.
• With the G.723 or G.729 codec, the
Mediatrix 1204 interprets incoming SID
packets as a period of silence and
activates the silence detection feature.
Disconnect the line if silence is detected
on the communication from the SCN
side to the IP side. Set the fxoFeocOnSilenceDetectionMode variable to
onScnSilent and:
• With the G.711 and G.726 codecs, set the
voiceIfG711VoiceActivityDetectionEnabl
e
parameter to at least transparent . See
“Voice Activity Detection” on page 210 .
• With the G.723 or G.729 codec, you do
not need to set specific parameters,
because its implementation in the
Mediatrix 1204 implicitly activates silence
detection (based on SID packets).
Disconnect the line only when silence is
detected on both sides of the
communication. Set the fxoFeocOnSilenceDetectionMode variable to
onIpAndScnSilent .
Disconnect the line when silence is
detected on either side of the
communication. Set the fxoFeocOnSilenceDetectionMode variable to
onIpOrScnSilent .