Huawei EchoLife ET323, Руководство пользователя

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EchoLife ET523 IP Phone User Manual 4 Configuration Guide
37
Field Description
Voice Frames
per TX This field contains the number of voice frames to be transmitted
in a single Ethernet packet (be advised the limit is based on the
maximum size of Ethernet packet, 1500 byte or 120 kbps).
When setting this value, you should pay attention to the
requested packet time (ptime used in SDP message). This
parameter is associated with the first codec in the above codec
preference list or the actual used payload type negotiated
between the 2 conversation parties at the running time. For
example, if the first codec is configured as G.723 and the
Voice
Frames per TX is set to 2 , then the ptime value in the SDP
message of an INVITE request will be 60 ms because each
G.723 voice frame contains 30 ms of audio. Similarly, if this
field is set to
2 and the first codec is G.729 or G.711 or G.726,
then the ptime value in the SDP message of an INVITE request
will be 20 ms.
If the configured voice frames per TX exceeds the maximum
value, the IP phone will use and save the maximum permitted
value for the corresponding first codec choice. The maximum
value for PCM is 10 (x10ms) frames; for G.726, it is 20 (x10ms)
frames; for G.723, it is 32 (x30ms) frames; for G.729/G.728, 64
(x10ms) and 64 (x2.5ms) frames respectively.
Pay attention to editing these parameters. Adjusting these
parameters will also change the dynamic jitter buffer. The
phone has a patent dynamic jitter buffer for handling algorithm.
The jitter buffer range is 20–200 ms.
You are recommends to use the default settings, and not to
change these parameters as a common user. Incorrect settings
will affect the voice quality.
Layer 3 QoS This field defines the Layer 3 QoS parameter. It is the value
used for IP Precedence or Diff-Serv or MPLS. The default value
is
48 .
Layer 2 QoS This contains the value used for Layer 2 VLAN tag. The default
setting is blank.
No Key Entry
Timeout The default value is 4 seconds. Dialed number will be sent out
after this set duration without pressing SEND
Use # as
Dial Key
This parameter allows users to configure the # key as the
SEND . If it is set to Yes , the # key will immediately send the
call. If it is set to No , the # key is included as part of the dial
string.