Draytek vigorphone 300 - Page 54

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8T mapping: If you have registered a Private SIP2 server and set dial-peer according to the above table，
all calls will be sent via SIP2 server when you press the numeric key “8” in front of dialing destination
phone numbers.
2T mapping: The rule of 2T means the user needs to dial the number with prefix 2 if he/she wants to
dial via IAX2 server.