Chapter 12 VoIP Trunking
Figure 121 PSTN Phone To VoIP Phone
12.4.3 PSTN Phone To PSTN Phone via VoIP
A PSTN phone A makes a call to the ZyXEL Device B. B connects to a peer device C and C forwards the call to a PSTN phone D.
Figure 122 PSTN Phone To PSTN Phone via VoIP
12.5 Trunking General Screen
Use this screen to enable VoIP trunking. Click VoIP > Trunking > General.
"VoIP Trunking requires the following additional configuration in the VoIP > SIP > SIP Settings > Advanced Setup screen: Voice Compression field needs to be set to G.729 and DTMF Mode field needs to be set to SIP INFO.
Figure 123 VoIP > Trunking > General
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