User manual

VOPTech GoIP User Manual

B. NAT Hold

This parameter is used to hold the port that is activated by the NAT for SIP signaling

communication. The unit of the parameter is m.

C. Timeout Setting

E. Signaling QoS

Quality of Service (QoS) is a network’s capacity to provide priority services, including the

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.