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Chapter 9 The VoIP General Screens
The following table describes the labels in this screen.
Table 48 VoIP > General > Media
LABEL
Port Range
Media Port Start
Media Port End
Codec Packetization Time Settings
G.711, G.729
Advanced
Voice Jitter
Buffer Type
Voice Jitter
Buffer Length
Packet Loss
Concealment
T.38 Static
Jitter Length
9.2.1 QoS
This section describes the features of the Quality of Service (QoS) screen.
136
DESCRIPTION
Enter the listening port number(s) for RTP traffic on the MAX208M2W
Series, if your VoIP service provider gave you this information.
Otherwise, keep the default values.
To enter one port number, enter the port number in the both Media
Port Start and Media Port End fields.
To enter a range of ports, enter the beginning port number of the range
in the Media Port Start field and the ending port number in the Media
Port End field.
Select the type of voice coder/decoder (codec) that you want the
MAX208M2W Series to use. G.711 provides high voice quality but
requires more bandwidth (64 kbps). G.729 requires only 8 kbps.
Voice jitter is a variation in delay of RTP packets delivery. This could
cause strange sound effects. The MAX208M2W Series can utilize the
following types of jitter buffer to minimize the effects of jitter.
Dynamic - Jitter buffer size is dynamically changed by RTP packets
delivery status.
Static - Jitter buffer size is fixed.
Select the maximum number of milliseconds of voice traffic the
MAX208M2W Series can help to smooth out the jitter in order to ensure
good voice quality for your conversations.
Packets may be dropped due to an overwhelming amount of traffic on
the network. Some degree of packet loss will not be noticeable to the
end user, but as packet loss increases the quality of sound degrades.
Select this to have the MAX208M2W Series to improve the voice quality
when packet loss occurrs.
T.38 is an ITU-T standard that VoIP devices use to send fax messages
over the Internet.
Select the number of milliseconds for the jitter buffer size used for
transmitting T.38 fax messages.
MAX208M2W Series User's Guide
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