User manual

Http://www.hybertone.com HT-822P VoIP FXS+PSTN Gateway

F） DTMF Signaling

1） DTMF TYPE

DTMF TYPE is used for telephone signaling over the line in the voice frequency band

to the call switching center. DTMF means that two groups of tone with different

frequencies are united into 16 kinds of dial tone. The telecommunication station,

switch or the phone service such as 1860 identify these special tones through DSP

analysis to confirm the keys dialed by user. There are two DTMF types: inband DTMF

type and outband DTMF type.

Inband DTMF type transfers these special dial tones together with the speech tone

without doing any special processing to them. So there is not any type as to inband

DTMF.

Outband DTMF type transfers these special dial tones by some special method to

confirm its correctness. The special method is the so called protocol such as

RFC2833 and SIP information.

2）DTMF Payload Type

DTMF Payload Type is used to carry telephony tones and telephony signals. By using

a distinct dynamic RTP payload type in the same RTP stream as the media, it is

possible to carry DTMF tones, fax-related tones, standard subscriber line tones,

country-specific tones and trunk events.

G） Signaling Qos

H） SIP Local Port

SIP Local Port is the local UDP port used by the SIP client to communicate with SIP proxy

and other SIP user agents.

I） Enable Call Wait

Select “Enable Call Wait”, you will enable your phone connected to the ATA to have the

function of call waiting.

4.4.3 Media Setting

Click on “Media Settings” in the “Call Setting” menu, the configuration screen of advance

settings will be displayed as follows. In this part, you will have more advance control over

the media.