User`s guide

MBR L13 – User’s Guide
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Figure 106: Advanced – Quality of Service
Type of Service (HEX)
This is a part of the IP header that defines the type
of routing service to be used to tag outgoing voice
packets originated from MBR. It is used to tell
routers along the way that this packet should get
specific QoS. Leave this value as 0XB8 (default) if
you are unfamiliar with the Differentiated Services
IP protocol parameter.
Use MSS Clamping to Reduce Voice
Delay
When using Maximum Segment Size (MSS)
Clamping, TCP streams routed via L13 when a voice
call is active, will have a smaller segment size. This
will cause RTP to receive better priority, and will
help prevent high voice jitter that is caused by slow
upstream transmission rate, and which is common
with most WAN connections (DSL, DOCSIS, etc.).
When checking this option, the Maximum Segment
Size (MSS) field appears. Change the maximal
segment size as necessary.
 To manage voice CODECs (administrator only)
Figure 107: Voice-Codecs selection
 To add a codec(administrator only):
The CODECs section enables you to add a voice codec for VoIP connections and specify the priority level of each
codec.
1. In the CODECs section, at the lower left, open the Add CODEC dropdown menu. All available voice codecs
that were not already selected appear in the menu.
2. Select the codec you want to add. The codec is added to the list of supported codecs.
 To change the order of priority of the supported codecs (administrator only):
Use the arrow action icons.
 To remove a codec from the list of supported codecs (administrator only):
Click the action icon.