26
Value gain: Reduce the network load, reduce the sound quality.
□
DTMF Transmit method: Select DTMF transmission format RFC2833, Sip info, In band.
Default is RFC2833
□
DTMF detection Sensitivity:
Value gain: Sensitivity enhancement, more digit issue may happen, suitable for enlarge the
item when dial short length number
Value less: Lower sensitivity, less digit issue may happen, suitable for enlarge the item when
dial the long length number.
Default is -1
□
DTMF volume: Sometimes no action when dial, you may adjust the function.
For example: when you make call to a company, you get an IVR, but no action when dial the
extension number, you may increase the value. Default is -2dB
□
RFC2833 Payload Type: Sending the DTMF tone as a RTP payload signal. The RFC2833
signaling
□
SIP INFO Duration (ms): Modify SIP INFO duration time.
□FAX type:
G711 fax pass through (not compressed by using a 64Kbps channel to transmit voice signals)
T.38 fax relay (fax encoded by IP protocol)
□
SIP Account Pooling (for Registered Accounts): SIP account sharing
□
Local Port call directly: the telephony port of the same gateway call each other, not send
invite packet message.
□
SIP Invite timeout: after send invite packet message, server not response the busy tone
within the seconds you set.
□
SIP 100red support: if enable the item, when device receive SIP : 183, will reply PACK.
4.1.3 Codec
A CODEC is an algorithm for taking voice or video and compressing the information. This type
of codec combines analog-to-digital conversion and digital-to-analog conversion functions in a
single chip. The Codec is used to compress the voice signal into data packets. Each Codec has
different bandwidth requirement. There are 9 kinds of codec, G.711/Ulaw, G.711/Alaw, G.729,
G.723 (5.3k / 6.3k bps), G.726 (16K bps), G.726 (24K bps), G.726 (32K bps), G.726 (40K bps),
GSM-FR