PLANET VIP-351PT - Manual (Page 43)

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Select DTMF Types
DTMF (Dual-Tone Multiple Frequency) is the tone you heard when you press a numeric key or *
and # key on conventional telephone. It’s impossible use certain online services (like online
banking service) without DTMF function.
To use DTMF function, you must select a proper DTMF type. Three types of DTMF are supported
by this phone: Transparent, RFC2833 relay, and SIP info. Your service provider should tell you
which mode you should use.
To change DTMF mode, please connect to this phone by web browser, and click ‘System’ link on
the left. Please select a proper DTMF type at ‘DTMF Type’, according to the instruction given by
your service provider.