H3C Technologies H3C SecPath F1000-E - Manual (Page 470)

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• Select 6(TCP) as the protocol type,
• Type 5.5.5.10 as the external IP address.
• Type 21 as the global port.
• Type 192.168.1.2 as the internal IP address.
• Type 21 as the internal port.
• Click Apply.
SIP/H.323 ALG Configuration Example
NOTE:
H.323 ALG configuration is similar to SIP ALG configuration. The following takes SIP ALG configuration
as an example.
Network requirements
As shown in Figure 10 , a company accesses the Internet through a device with NAT and ALG enabled.
The inside network segment of the company is 192.168.1.0/24. You need to configure NAT and ALG to
meet the following requirements:
• SIP UA 1 in the inside network and SIP UA 2 in the outside network can communicate with their
aliases.
• The company has four public network addresses: 5.5.5.1, 5.5.5.9, 5.5.5.10, and 5.5.5.11. SIP UA
1 selects one from the range 5.5.5.9 to 5.5.5.11 as its public network address when registering
with the SIP server in the outside network.
Figure 10 Network diagram for SIP ALG configuration
Configuration procedure
Step1 Configure ALG.
# Configure SIP ALG. (By default, the SIP ALG function is enabled, and thus this step can be omitted.)
• Select Firewall > ALG from the navigation tree. Add the SIP protocol to the selected protocol list
as shown in Figure 11 .