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H.245 is the media control protocol of the H.323. It is used to specify the port that receives the
H.245 connection (TCP) and used with the router port for mapping.
D. Fast Start
You can enable or disable the fast start described in the H255.0 protocol. This parameter is used 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