6
Setting the VoIP Parameters
6.1
Voice Service Introduction
The HG655d supports voice services based on the Session Initiation Protocol (SIP).
The SIP is an application layer protocol used to create, modify, or end multimedia
sessions.
The HG655d enables voice service interworking between the Internet and the Public
Switched Telephone Network (PSTN).
6.2
Networking
Figure 6-1 shows the network model of voice services.
Figure 6-1
Network model of voice services
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