ZyXEL Communications Corporation IX280P Manual De Usuario

 Chapter 10 The Service Configuration Screens

MAX-207HW2R User’s Guide

Client device A then sends the call invitation to client device C.

Figure 44   SIP Redirect Server

The MAX-207HW2R must register its public IP address with a SIP register server. 
If there is a NAT router between the MAX-207HW2R and the SIP register server, 
the MAX-207HW2R probably has a private IP address. The MAX-207HW2R lists its 
IP address in the SIP message that it sends to the SIP register server. NAT does 
not translate this IP address in the SIP message. The SIP register server gets the 
MAX-207HW2R’s IP address from inside the SIP message and maps it to your SIP 
identity. If the MAX-207HW2R has a private IP address listed in the SIP message, 
the SIP server cannot map it to your SIP identity. See 

 for more information.

Use a SIP ALG (Application Layer Gateway), Use NAT, STUN, or outbound proxy to 
allow the MAX-207HW2R to list its public IP address in the SIP messages.

DiffServ is a class of service (CoS) model that marks packets so that they receive 
specific per-hop treatment at DiffServ-compliant network devices along the route 
based on the application types and traffic flow. Packets are marked with DiffServ 
Code Points (DSCPs) indicating the level of service desired. This allows the 
intermediary DiffServ-compliant network devices to handle the packets differently 
depending on the code points without the need to negotiate paths or remember 
state information for every flow. In addition, applications do not have to request a 
particular service or give advanced notice of where the traffic is going.