Using Web Manager for Configuration
Page 51
FortiFone™ User Guide for FON-260i
QoS Configuration
Only make adjustments if you understand how these features work.
Diffserv Configuration
DiffServ Code Point (DSCP) or ToS establishes the priority of voice packets. Compatible routers
apply the DSCP for packet priority, handling higher priority packets first. However, at congested
routers, higher priority packets are discarded first. Thus, a median value for DSCP is
recommended.
IEEE 802.1Q
The VLAN tag defines the priority for Ethernet frames and the VLAN ID based on IEEE 802.1p/q.
If using with FortiVoice phone systems, 802.1p/q tagging is not currently supported. The phone
PC and LAN (voice) ports use separate VLAN tags. With a VLAN ID assigned, only frames with
the ID are accepted and frames sent from the phone include the LAN port ID and priority. In
addition, the PC, LAN ports and the default gateway must be assigned to employ the VLAN
tags for proper operation.
Jitter Buffer Configuration
A jitter buffer stores incoming packets to allow for re-sequencing of packets received out of
order. The jitter buffer configuration controls the size of the buffer used. The minimum, normal
and maximum delays expected can be changed. Using larger values produce less packet loss
as the phone waits longer to receive packets before processing. Note that large values may
delay voice packet processing and smaller values may produce more packet loss but quicker
voice packet processing. We recommend you use the default settings.
Summary of Contents for FortiFone
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