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Chapter 3 – Related MultiVOIP Setup Parameters
38 Multi-Tech Systems, Inc. Avaya Communication Manager Guide
Voice/Fax Parameter Definitions Continued
Field Name Values Description
DTMF Parameters
DTMF Gain --
The DTMF Gain (Dual Tone Multi-Frequency) controls
the volume level of the DTMF tones sent out for Touch-
Tone dialing.
DTMF Gain,
High Tones
+3dB to -31dB &
“mute”
Default value: -4 dB. Not to be changed except under
supervision of MultiTech’s Technical Support.
DTMF Gain,
Low Tones
+3dB to -31dB &
“mute”
Default value: -7 dB. Not to be changed except under
supervision of MultiTech’s Technical Support.
Duration
(DTMF)
60 – 3000 ms
When DTMF: Out of Band is selected, this setting determines
how long each DTMF digit ‘sounds’ or is held. Default = 100
ms.
DTMF
In/Out of
Band
Out of Band, or Inband
When DTMF Out of Band is selected, the MultiVOIP detects
DTMF tones at its input and regenerates them at its output.
When DTMF Inband is selected, the DTMF digits are passed
through the MultiVOIP unit as they are received.
FAX Parameters
Fax Enable Y/N Enables or disables fax capability for a particular channel.
Max Baud
Rate
(Fax)
2400, 4800, 7200, 9600,
12000, 14400 bps
Set to match baud rate of fax machine connected to channel
(see Fax machine’s user manual). For CM managed fax calls it
is recommended to use 9600.
Default = 14400 bps.
Fax Volume
(
Default =
-9.5 dB
)
-18.5 dB
to –3.5 dB
Controls output level of fax tones. To be changed only under
the direction of Multi-Tech’s Technical Support.
Jitter Value
(Fax)
Default =
400 ms
Defines the inter-arrival packet deviation (in milliseconds) for
the fax transmission. A higher value will increase the delay,
allowing a higher percentage of packets to be reassembled. A
lower value will decrease the delay allowing fewer packets to
be reassembled.
Mode (Fax) FRF 11; T.38
FRF11 is frame-relay FAX standard using these coders: G.711, G.728,
G.729, G.723.1.
T.38 is an ITU-T standard for storing and forwarding FAXes
via email using X.25 packets. It uses T.30 fax standards and
includes special provisions to preclude FAX timeouts during
IP transmissions. Must use T.38 when faxing to/from CM.
Note: When the MultiVOIP stops receiving T.38 packets, it will
wait ten seconds before switching to voice mode.
Coder Parameters
Coder Manual or
Auto-matic
Determines whether selection of coder is manual or
automatic. Must be set to manual for CM managed calls.
When Automatic is selected, the local and remote voice
channels will negotiate the voice coder to be used by
selecting the highest bandwidth coder supported by
both sides without exceeding the Max Bandwidth
setting. G.723, G.729, or G.711 are negotiated.