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DTMF InBand:
Choose this one then the 2600V will send the DTMF tone as audio
directly when you press the keypad on the phone
DTMF OutBand:
Choose this one then the 2600V will capture the keypad number
you pressed and transform it to digital form then send to the other side;the receiver
will generate the tone according to the digital form it receive. This function is very useful
when the network traffic congestion occur and it still can remain the accuracy of DTMF
tone.
DTMF Payload type:
Choose a number between 96 to 127, the default value was 101.
RTP:
Specify the start and end port for RTP stream. The default values are 10050 and
15000.
Packet Size:
the amount of data contains in a single packets. The default value is
20 ms, it means the data packet will contains 20 ms voice information. The more data
contains in a single packet the less overhead it create but may increase .
Default Codec:
there are five different CODECs you can choose as your prefer
CODEC that you wish to use. However,the real CODEC be used was negotiate with
peer party before session was established. The default CODEC is G.729A/B; it
occupied less bandwidth while still have good voice quality.
NOTE:
if your ADSL up stream speed only have 64Kbps, do not use G.711 CODEC.
