ZyXEL Communications ZYWALL 70 - V4.04 Guida Utente Pagina 106

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Figure 1.
But there are still some limitations remain that we need to overcome in the future. When
you deploy your SIP server on LAN for SIP service, please make sure that prevent
your topology from any case listed as below.
(1) When SIP client is on LAN, do not use NAT lookback on SIP server.
When there is a SIP server on the LAN, for those SIP clients on WAN, we can set a port
forwarding rule or address mapping rule to let them to use WAN IP to access the SIP
server behind the ZyWALL, but for those SIP clients which is behind the ZyWALL,
please just use the SIP servers LAN IP and DON’T use the public IP as their SIP server
IP, the ZyWALL doesn’t support such a loopback case on SIP registration/proxy server.
For instance, in Figure 2, there is a SIP server on LAN, and there are also two SIP phones
E and F on LAN want to talk to each other. Although there is a NAT port forwarding rule
for outside SIP clients to use 211.72.158.200 to connect to SIP server, but please let
phone E and F use SIP servers LAN IP 192.168.1.200 to connect to SIP server directly.
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