Operation Manual – Location Server Configuration
H3C XE 200/2000 IP PBX
Chapter 2 NAT/FW Tunnel Traversal
2-3
proxy FW intercepts network traffic completely. It monitors traffic at application layer by
using the proxy programs specifically designed for different kind of application services.
Application proxy FWs are usually implemented using dedicated workstations.
2.1.3 NAT/FW Tunnel Traversal Function Provided by XE IP PBXs
A tunnel here refers to a TCP or UDP channel traversing the NAT/FW between a private
network and a public network. NAT/FW tunnel traversal refers to the communication
across NAT/FW through tunnels.
The NAT/FW tunnel traversal function provided by XE IP PBXs enables voice
communication between a private network and a public network across a NAT/FW or
between two private networks across NAT/FWs. The NAT/FW tunnel traversal function
is also available in networks containing both H.323 and SIP devices.
Note:
z
You need to set the call mode of the XE IP PBX as routed mode to enable NAT/FW
tunnel traversal for it.
z
Currently, the tunnel traversal function implemented on XE IP PBXs only supports
common call services, instead of voice services.
Before the NAT/FW traversal function can take effect between the private and public
networks deployed with XE IP PBXs, the following three types of tunnels must be
established:
z
A TCP tunnel between the PS in the private network and the LS in the public
network
z
A TCP tunnel between the PS in the private network and the PS in the public
network
z
An UDP tunnel between the PS in the private network and the PS in the public
network, which is used to transmit voice media stream
Before these types of tunnels can be established, the corresponding ports must be
enabled by the administrator on the FW.
The procedure to establish these tunnels is as follows:
1)
The PS in the private network initiates a TCP connection request to the LS in the
public network through the NAT/FW to establish a TCP tunnel between two of
them.
2)
The LS issues the tunnel configuration information to the PS in the public network
and the PS in the private network.
Содержание XE 200/2000 IP
Страница 7: ...Basic Configuration ...
Страница 42: ...Process Server Configuration ...
Страница 82: ...Location Server Configuration ...
Страница 182: ...Feature ...
Страница 259: ...System Management ...
Страница 341: ...IP Performance and Application ...
Страница 349: ...Media Server ...
Страница 360: ...Call Services ...
Страница 507: ...Appendix A ...
Страница 511: ...Appendix B ...