User manual

得伯乐科技有限公司
DBL Technology Limited GoIP User Manual
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special bandwidth, jitter control and delay (used for real-time and interactive traffic), and
improvement of the packet loss ratio. This parameter is used to mark the specified QoS label for the
call signaling packet to increase the network service quality.
F. 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 into 16 types of dialing
tones. The telecom office or 1860 service hotline identifies these dialing tones through analyzing the
DSP, and thus determines the dialing number. There are two types of DTMF signals: 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 and SIP INFO,
which can ensure the validity of the transmission.
G. Registration Mode
When the registration information is sent to the platform under Mode 1, “experise” info is
included. When the registration information is sent to the platform under Mode 2, “experise” variable
is not sent.
3.5.4 Media Advance Setting
The media advance setting is set for the RTP media stream of the gateway. Select “Call