User`s guide

Networks
2 - 13
Specifying Quality of Service
Set the Quality of Service options for the way your network handles IP packets
during video calls.
To specify Quality of Service:
1. Go to System > Admin Settings > Network > IP > Quality of Service.
2. Configure these settings on the Quality of Service screen:
Setting Description
Type of Service Specifies your service type and lets you choose how to set the
priority of IP packets sent to the system for video, audio, and
far-end camera control:
• IP Precedence — Represents the priority of IP packets
sent to the system. The value can be between 0 and 5. If
this setting is selected, enter the value in the Type of
Service Value field.
• DiffServ — Represents a priority level between 0 and 63. If
this setting is selected, enter the value in the Type of
Service Value field.
Type of Service
Value
Specifies the IP Precedence or Diffserv value for Video, Audio,
and Control.
• Audio—audio RTP traffic and associated RTCP traffic
• Video—video RTP traffic and associated RTCP traffic
• Control—traffic on any of the following channels:
— H.323—H.225.0 Call Signaling, H.225.0 RAS, H.245,
Far End Camera Control
— SIP—SIP Signaling, Far End Camera Control, Binary
Floor Control Protocol (BFCP)
Maximum
Transmission
Unit Size
Specifies the Maximum Transmission Unit (MTU) size used in
IP calls. If the video becomes blocky or network errors occur,
packets may be too large; decrease the MTU. If the network is
burdened with unnecessary overhead, packets may be too
small; increase the MTU.
Enable PVEC Allows the system to use PVEC (Polycom Video Error
Concealment) if packet loss occurs.
Enable RSVP Allows the system to use Resource Reservation Setup Protocol
(RSVP) to request that routers reserve bandwidth along an IP
connection path. Both the near site and far site must support
RSVP in order for reservation requests to be made to routers
on the connection path.