ViewStation EX, ViewStation FX Administrator's Guide VS4000
Administrator’s Guide for ViewStation EX, ViewStation FX, and VS4000
3-12  www.polycom.com/videodocumentation
3. Select Next and enter a prefix or suffix for each bandwidth you want to allow 
for gateway calls. 
Be sure to configure the gateway to use the same prefixes and suffixes you define for 
the system.
Specifying Quality of Service
Set the Quality of Service options for the way your network handles IP packets 
during video calls. 
To specify the Quality of Service:
1. Go to System Info > Admin Setup > LAN/H.323 > QOS.
2. Configure these settings:
Area Code Specifies the area or city code for the system’s location.
Number Specifies the gateway’s number.
Extension Specifies the extension that identifies this system for incoming 
gateway calls. 
The default H.323 Extension is initially based on the system serial 
number, but it can be changed. 
Number of Digits in 
DID Number
Specifies the number of digits configured by your network 
administrator.
Number of Digits in 
Extension
Specifies the number of digits configured by your network 
administrator.
Setting Description
Setting Description
Type of Service 
(ToS) Field
Lets you choose your service type.
Type of Service 
(ToS) Value
Specifies the value of the Type of Service (ToS) byte in the IP 
packet header for video, audio, and far-end camera control. These 
values are supported:
Type of Service Minimum Value Maximum Value
IP Precedence: 0  5
Diffserv: 0  63










