T.38 Fax Transmission
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T.38 Fax Transmission
T.38 is an ITU recommendation for allowing transmission of fax over IP networks in real time.
PROs
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Allows for redundancy, therefore increases the reliability of the transmissions.
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Faxes in T.38 are not as sensitive to network imperfection like packet loss or jitter as faxes in
Clear Channel.
CONs
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The number of redundancy packets will increase the bandwidth used
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The higher the speed, the more bandwidth is used.
•
May take more bandwidth than a fax in Clear channel.
Requirements
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The Mitel unit must be able to detect a CNG, v21 preamble or T.38 packet to switch to T.38
•
Reasonable delay, 1 second round trip is acceptable however 2 seconds could cause timeout
or collision
Configuration
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Enabling T.38 Fax Transmission
•
•
Allowing Unsecure T.38 with Secure RTP
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Selecting the Base Port for T.38 Fax Calls
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