InnoMedia MTA8000 Series Administrative Guide
Page 35
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4.1.7
Fax Setting
Configure the parameters for sending and receiving a fax over the VoIP channel. Two major approaches can
be used for fax over IP.
•
G.711, sending fax signals in-band using the coding method used in regular voice transmissions, or
•
T.38, a protocol that sends fax image data over the IP network. T38 is designed for more efficient and
robust transmission compared to using the same method as voice communications.
There are pros and cons of both approaches described above. Consult your service provider for the
appropriate configuration when needed.
Figure 26. Fax Setting
Field Name
Description
Basic Setting
Jitter Buffer Size
A jitter buffer temporarily stores arriving
packets in order to minimize the impact of
delay variations.
If the jitter buffer size is too small, then an
excessive number of fax packets may be
discarded when network jitter occurs. If a
jitter buffer is too large, then it introduces
additional delay.
Fax PTime
Available Options:
10, 20, 30, 40, 50, 60 (ms).
T38 Setting
Enable T38
Enable/Disable T.38 Fax feature.
Allow ECM
Enable Error Correction Mode (ECM) for fax
transmission.
Max Speed
Bit Rate. Choose a maximum fax
transmission speed to be attempted: 2400,
4800, 9600, or 14400.
