1/5/2007
EAG Gateway Series Administration Guidelines
MAG-06007 Rev. A
First Digit Timeout
In the First Digit Timeout field enter the time (in second) allowed for the dialing of the first digit. When a
line goes off-hook, if within the time specified here the first digit has not been dialed, EAG will treat this
as an abandoned called and will indicate to the caller to place the phone on hook. The default value is
12 seconds.
Inter Digit Timeout
In the Inter Digit Timeout field enter the time (in second) allowed for the dialing of the middle digits.
Counting from the last digit dialed, if within the time specified here no digit has been dialed, the system
will send the dialed number out. The default value is 12 second.
Critical Digit Timeout
In the Critical Dgt Timeout field enter the time (in second) for finished dialing.
This parameter is
used in conjunction with x.T in the dialing rule. After the first digit in the rule has been dialed, if within
the time specified here no digit follows, EAG will send the dialed number out. The default value is 5
seconds.
DTMF Method
In the DTMF
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Mode field select the transmission mode. This parameter is used to set DTMF signal
transmission mode. Options are Audio mode, 2833 mode, and INFO mode. The default setting is Audio
mode.
․
Audio mode is a transparent transmit mode;
․
INFO mode is information transmit mode;
․
2833 mode is a RTP data packet transmit mode.
In the Default codec
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field select the codec EAG supports. EAG 0 supports iLBC/30, G729A/20,
G723/30, PCMU/20, PCMA/20 and GSM/20 (as shown in Table 5-1). Multiple values are demarked by
commas. When multiple modes are selected, the gateway will, in a sequential order, select the mode
supported by both sides.
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DTMF (Dual Tone Multi-Frequency) In PSTN service, after a call is connected, user’s touch tone info is
transmitted via DTMF, also known as second dial tone information. It is widely used in intelligent network and
value-added services.
Audio: Voice data transparent transmit mode.
2833: A special RTP packet. PT field of the header indicates this is a DTMF packet. See FTC 2833 for details.
INFO: Optional way of DTMF transmission. As in SIP messages, use INFO to indicate a DTMF signal.
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Also called a "voice codec" or "vocoder," it is a hardware circuit that converts the spoken word into digital
code and vice versa. It comprises the A/D and D/A conversion and compression technique. If music is encoded
with a speech codec, it will not sound as good when decoded at the other end. A speech codec is an audio codec
designed for human voice. By analyzing vocal tract sounds, a recipe for rebuilding the sound at the other end is
sent rather than the soundwaves themselves. The speech codec is able to achieve a much higher compression
ratio, which results in a smaller amount of digital data for transmission. When telephones were first digitized in
the early 1960s, they generated digital streams of 64 Kbps. Since then, speech CODECS have reduced voice to
as little as 5 Kbps and less.
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