ZyXEL Communications ISG50 User Manual

 Chapter 25 Bandwidth Management

ISG50 User’s Guide

• Enable maximize bandwidth usage so the SIP traffic can borrow unused bandwidth.

SIP Any to WAN Bandwidth Management Example

You also create a policy for calls coming in from the SIP server on the WAN. It is the same as the 
SIP Any to WAN policy, but with the directions reversed (WAN to Any instead of Any to WAN).

• Inbound traffic gets more bandwidth as the local users will probably download more than they 

upload (and the ADSL connection supports this). 

• Second highest priority (2). Set policies for other applications (except SIP) to lower priorities so 

the local users’ HTTP traffic gets sent before non-SIP traffic.

• Enable maximize bandwidth usage so the HTTP traffic can borrow unused bandwidth.

HTTP Any to WAN Bandwidth Management Example

• ADSL supports more downstream than upstream so you allow remote users 300 kbps for uploads 

to the DMZ FTP server (outbound) but only 100 kbps for downloads (inbound).

• Third highest priority (3).