PLANET CS-2001 - Manual (Page 236)

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10.1.3 A VoIP Session Between an External and Internal User
(VoIP Ports: TCP 1720, TCP 15321-15333 and UDP
15321-15333)
Step 1. Configure internal VoIP user with the IP address: 192.168.1.100.
Step 2. Under Policy Object > Address > LAN, set as below:
（Figure 10-14）
Figure 10-14 The Address Settings
Step 3. Create
a VoIP service under Policy Object > Service > Custom. (Figure
10-15)
Figure 10-15 The Completed Custom Service