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InnoMedia 8328-1 Administrative Guide
Page 28
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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 are
adopted 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 describes how to send 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 19. 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 a jitter buffer size is too small, then an
excessive number of fax packets may be
discarded. 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 the
MTA.
Max Speed
Bit Rate. Choose a maximum fax
transmission speed to be attempted: 2400,
4800, 9600, or 14400.
Redundancy Level
Low Speed Redundancy. Number of