ELTEX TAU-32M.IP, Руководство по эксплуатации, Страница: 146 / 334

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146 Universal Network Terminal TAU-32M.IP
is detected from the subscriber's line;

Caller –tones are detected only during fax transmission. During fax transmission, CNG FAX signal is
detected from the subscriber's line;

Callee –tones are detected only during fax receiving. During fax receiving, V.21 signal is detected
from the subscriber's line;
–
Fax Transfer Codec –master protocol/codec used for fax transmissions:

G.711A –use G.711A codec for fax transmissions. Switching to G.711A codec will be performed when
the corresponding tones are detected;

G.711U –use G.711U codec for fax transmissions. Switching to G.711U codec will be performed when
the corresponding tones are detected;

T.38 mode –use Т.38 protocol for fax transmissions. Switching to T.38 will be performed when the
corresponding tones are detected.
–
Slave Fax Transfer Codec –slave protocol/codec used for fax transmissions. This codec is used when the
opposite device does not support the priority:

G.711A – use G.711A codec for fax transmissions. Switching to G.711A codec will be performed
when the corresponding tones are detected;

G.711U – use G.711U codec for fax transmissions. Switching to G.711U codec will be performed
when the corresponding tones are detected;

T.38 mode – use Т.38 protocol for fax transmissions. Switching to T.38 will be performed when the
corresponding tones are detected.

Off – disable slave protocol/codec.
The primary and redundant protocol/codec should differ from each other.
–
Modem Transfer –defines switching into 'Voice band data' mode (according to V.152 recommendation). In
VBD mode, the gateway disables the voice activity detector (VAD) and comfort noise generator (CNG), this
is necessary for establishing a modem connection.

Off – disable modem signal detection;

G.711A VBD –use G.711A codec to transfer data via modem connection. Switching to G.711A codec
in VBD mode will be performed when the CED tone is detected;

G.711U VBD –use G.711U codec to transfer data via modem connection. Switching to G.711U codec
in VBD mode will be performed when the CED tone is detected;

G.711A RFC3108 –use G.711A codec to transfer data via modem connection. When entering modem
data transfer mode via SIP protocol, echo cancellation and VAD are disabled with attributes
described in RFC3108 recommendation:

a=silenceSupp:off - - - -

a=ecan:fb off -;

G.711U RFC3108 –use G.711U codec to transfer data via modem connection. When entering modem
data transfer mode via SIP protocol, echo cancellation and VAD are disabled with attributes
described in RFC3108 recommendation:

a=silenceSupp:off - - - -

a=ecan:fb off -;