Draytek VIGOR3300V+ User Manual page 86

Phone 3 calls Phone 1---->Press 12345678. After getting through you will hear the Dial tone,
then press the VoIP number 888833#.
Note: # indicates termination of the phone number. After pressing #, VoIP is
immediately called out. Or, you may wait 3 seconds if you do not press #.
Connect PBX's Inside Lines. The usage is the same as that of common extension.
Different PBX has its own settings and required configuration by you.
By connecting 3300V+'s FXO Port5 to PBX's Inside Line, VoIP is seamlessly integrated to
PBX's inside lines and allows you to call not only the VoIP, but also the PSTN line and
PBX's extension. Also the remote user can call you from the PSTN line and PBX's
extension.
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Vigor3300V+ Series User's Guide