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Intranet SIP Phone Users Accessing Extranet SIP Phone Users
An enterprise has multiple SIP phone users and they need to communicate with SIP phone user A on the Internet frequently. For example, a conference call is often held between user A and multiple intranet users. As shown in Figure 5-25, the voice function must be configured on the SIP phones of users, the dynamic NAT function must be configured on the Router, and NAT ALG function must be configured on the Router; otherwise, SIP packets cannot traverse the NAT device.
