Huawei eSpace 6805 Administrator's Manual page 26

Huawei IP Phone eSpace
6805&6810&6830&6850&6870
Administrator Guide
Field
Symmetric RTP
Silence
Suppression
Voice Frames per
TX(unit: 10 ms)
No Key Entry
Timeout
Use # as Dial Key
G723 Rate
G.726-32 Packing
Mode
iLBC frame size
Issue 01 (2012-06-20)
Description
connected using SRTP or not.
Indicates whether the eSpace 6870 supports the symmetric RTP. If
this parameter is set to Yes, a phone ignores the host address in the
RTP stream contained in SDP messages, and sends RTP messages to
the host address in the RTP stream that is received.
This parameter controls the silence suppression or VAD feature of
the audio codec G.711.
 If the parameter is set to Yes and there is no call, a small number
of CNG packets are sent, and then a small number of VAD
packets (instead of audio packets) are sent.
 If the parameter is set to No, this feature is disabled.
Number of voice frames to be transmitted in a single Ethernet packet.
When setting this value, you must pay attention to the requested
packet time (ptime used in SDP message). This parameter is
associated with the first codec in the preceding codec preference list
or the actual used payload type negotiated between the two
conversation parties at the running time. For example, if the first
codec is configured as G.723.1 and Voice Frames per TX is set to 2,
the value of ptime in the SDP message of an INVITE request is 60
because each G.723.1 voice frame contains 30 ms of audio.
Similarly, if this parameter is set to 2 and the first codec is G.729AB,
G.711 A-law/μ-law or G.726, the value of ptime in the SDP message
of an INVITE request is 20.
If the configured voice frames per TX exceed the maximum value,
the IP phone uses and saves the maximum permitted value for the
corresponding first codec choice. The maximum value of all the
codec is 90 ms.
Pay attention to the parameter modifications. The parameter
adjustment also changes the dynamic jitter buffer. The phone has a
patent dynamic jitter buffer for the handling algorithm. The jitter
buffer ranges from 20 to 200 ms.
You are advised to use the default settings and not to change the
parameters as a common user because incorrect settings will affect
the voice quality.
The default value is 6. The dialed number is sent after this preset
duration without pressing the SEND soft key.
This parameter allows users to set the pound key (#) as SEND. If the
parameter is set to Yes, the call can be sent immediately by pressing
the pound key. If the parameter is set to No, the pound key is
included as part of the dial string.
G.723 audio codec encoding rate, either 6.3 kbit/s or 5.3 kbit/s.
Check the ITSP.
The parameter is invalid.
iLBC audio CODEC frame size, which is either 20 ms or 30 ms:
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