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Prestige 2602HWNLI-D7A Support Notes
All contents copyright (c) 2007 ZyXEL Communications Corporation.
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Caution: When Region Settings are changed, you need to reboot the device for the settings to take effect.
Trunking
VoIP trunking connects an IP network (like the Internet) and the Public Switched Telephone Network (PSTN).
PSTN includes the world’s circuit-switched telephone network which is composed of fixed and mobile
telephones.
VoIP trunking allows you to create VoIP links which PSTN (Public Switched Telephone Network) callers can
use to:
* Make phone calls via the Internet - Make a PSTN call to the ZyXEL Device and it forwards the call to any
SIP based VoIP phone.
* Save on long distance calls - The ZyXEL Device creates a VoIP link which can be used to connect to a PSTN
phone in another country, province, region and so on.
Similarly, VoIP callers can:
* Make calls to PSTN subscribers at reduced cost - Connect to the ZyXEL Device via VoIP and the ZyXEL
Device forwards the call to a PSTN phone.
Creating a link over the IP network requires two VoIP devices. VoIP trunking scenarios vary depends on how
the VoIP devices work together and how they receive or forward PSTN calls. The following sections describe
the details of VoIP trunking.
Note: VoIP Trunking requires the following additional configuration in the VoIP > SIP > SIP Setting >
Advanced Setup screen: Voice Compression field needs to be set to G.729 and DTMF Mode field needs to be
set to SIP INFO.