User manual

得伯乐科技有限公司
DBL Technology Limited GoIP User Manual
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to detect and solve the compatibility problem. If you are not sure, do not set this parameter.
E. Fast Start Extension
This parameter is set for the special requirement of some customers. If you are not sure, do not
set this parameter.
F. H245 Tunnel
This parameter is set for the special requirements of some customers. If you are not sure, do not
set this parameter.
G. Registration Mode
This parameter is used to comply with different PBXs and is not set normally.
H. DTMF Signals
DTMF signals are used to transmit call signals to the call switching center over the audio band.
The DTMF means that two different frequencies of sounds are combined to 16 types of dialing tones.
The telecom office or 1860 service hotline identify these dialing tones by analyzing the DSP, and thus
determining the dialing number. There are two types of DTMFs: inband DTMF and outband DTMF.
1). Inband DTMF
The inband DTMF transmits dialing tones and call voices together, without any processing.
Therefore, the inband DTMF transmits DTMF signals through a single way.
2). Outband DTMF
The outband DTMF transmits dialing tones over protocols, such as RFC2833, which can ensure
the validity of the transmission.