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TAU-4M.IP Subscriber gateway
Payload Type
- dynamic payload type for codecs G.726-24 or G.726-32 (permitted values - from 96
to 127).
Fax and Modem Transfer
Modem transfer
- selecting of codec, that will be used for data transmission when modem signals
detecting by the gateway:
–
Off — disable modem signal detection;
–
G.711a VBD – use G.711A codec in VBD mode;
–
G.711u VBD – use G.711U codec in VBD mode.
In VBD mode, the gateway disables the voice activity detector (VAD), comfort noise generator (CNG) and
echo canceller; this is necessary for establishing a modem connection.
The chosen codec should be active in voice codecs list too.
Fax codec 1...3
- allows you to select codecs and an order of their usage. Codec with the highest
priority should be placed in 'Fax codec 1' field. For processing it is necessary to point at least one
codec:
–
Off – codec is not used.
–
G.711A – use G.711A codec;
–
G.711U – use G.711U codec;
–
T.38 – use T.38 protocol.
All fax codecs should be different! In addition when selecting G.711a or G.711u relecant
codec should be active in the list of device voice codecs.
Take the Transition to T.38
- when checked incoming
re-invite
to T.38 from oncoming gateway is
allowed;
T.38 Redundancy Count
- adding the redundancy into T.38 packets; value is corresponding to
amount of previous packets, which is doubling in every new
T.38 packet.
This redundancy method
is intended for case when the packets are lost in the transfer.
Additional parameters
DTMF Transfer
–DTMF tone transmission method:
–
Inband
;
–
RFC2833
–according to RFC2833 recommendation, as a dedicated payload in RTP voice
packets;
–
SIP Info
- transmission of the messages via SIP in INFO queries.
Payload type for RFC2833 packets
- payload type for packets transmission via RFC2833 (permitted
values: 96 to 127);
Silencedetector
— use silence detector when enabled;
Echocanceller
— use echocanceller when checked;
Dispersion time, ms
- parameter, that allows to fight with echo, caused by voice signal dispersion.
Parameter values are changing in the range from 2 to 128 ms.
Max Call Number
- this parameter allows to restrict simultaneous calls on one direction amount.