ZyXEL MAX-306 User Guide - Page 162

NAT and SIP, 12.4.7 DiffServ, Use a SIP ALG Application Layer Gateway, Use NAT, STUN

Page 162 highlights

Chapter 12 The Service Configuration Screens 3 Client device A then sends the call invitation to client device C. Figure 75 SIP Redirect Server 1 2 A B 3 C 12.4.6 NAT and SIP The WiMAX Device must register its public IP address with a SIP register server. If there is a NAT router between the WiMAX Device and the SIP register server, the WiMAX Device probably has a private IP address. The WiMAX Device 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 WiMAX Device's IP address from inside the SIP message and maps it to your SIP identity. If the WiMAX Device has a private IP address listed in the SIP message, the SIP server cannot map it to your SIP identity. See Chapter 10 The NAT Configuration Screens for more information. Use a SIP ALG (Application Layer Gateway), Use NAT, STUN, or outbound proxy to allow the WiMAX Device to list its public IP address in the SIP messages. 12.4.7 DiffServ 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. 162 User's Guide

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Chapter 12 The Service Configuration Screens
User’s Guide
162
3
Client device A then sends the call invitation to client device C.
Figure 75
SIP Redirect Server
12.4.6
NAT and SIP
The WiMAX Device must register its public IP address with a SIP register server. If
there is a NAT router between the WiMAX Device and the SIP register server, the
WiMAX Device probably has a private IP address. The WiMAX Device 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
WiMAX Device’s IP address from inside the SIP message and maps it to your SIP
identity. If the WiMAX Device has a private IP address listed in the SIP message,
the SIP server cannot map it to your SIP identity. See
Chapter 10 The NAT
Configuration Screens
for more information.
Use a SIP ALG (Application Layer Gateway), Use NAT, STUN, or outbound proxy to
allow the WiMAX Device to list its public IP address in the SIP messages.
12.4.7
DiffServ
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.
A
C
B
1
3
2