User manual

Four-Channel GSM VoIP Gateway
24
A RTP Port Range
This parameter specifies the range of the RTP (Real Time Protocol) Ports used by the
GoIP4 Gateway. If your network limits the usable port range, this parameter may need to
be modified. Please consult your network administrator for more information.
B Packet Length(ms)
This parameter defines the voice packet length. The default setting is 20ms. The range
is from 5ms to 40ms at an increment of 5ms. Please note that some codes have a
minimum packet length of more than 5ms.
C Jitter Buffer Mode
Since data packets may arrive at different orders, the Jitter Buffer is used to hold the
data packets received for re-arrangement according to the packet sequence number.
Three Jitter Buffer Modes are supported: Adaptive, Sequential, and Fixed. The default is
set to Fixed mode with the fixed delay of 60ms. Please consult your network
administrator for more information on the network environment in order to determine
the optimal settings.
D Media Qos
Similar to the Signaling QoS, the Media Qos in intended to improve the voice
performance or quality if your local network supports QoS.
E Media Encryption