Avaya Business Communications Manager 5.0 - Planning and Engineering User Manual Page 211

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Nortel Business Communications Manager 5.0
Planning and Engineering
NN40170-200 01.03 Standard
August 2009
Copyright © 2009 Nortel Networks
SIP fax over G.711
This section gives an overview of SIP fax over G.711. This feature allows fax
to be transmitted using G.711 over SIP trunks in networks that contain SIP
endpoint devices that do not support T.38 fax.
Prerequisites for SIP G.711configuration
Perform the following prerequisites for SIP G.711configuration:
Configure IP trunks and gateways before you set up the G.711 fax
protocol. For more information about configuring VoIP trunks,Line
configuration overview (page 17)
To configure this feature, designate the analog ports to which fax
machines are connected as Modem rather than Telephone. This indicates
to IP trunks that the bearer capability of these ports is 3.1 K audio.
You can choose between T.38 or G.711 to transmit fax calls over SIP
trunks. T.38 and G.711 are mutually exclusive. If you choose G.711 for fax
transport, T.38 is not used. If you choose T.38, G.711 is not used.
The choice between T.38 and G.711 is made on the SIP Media
Parameters panel and applies to all SIP trunk calls.
Both ends of the SIP call are responsible for “listening” for fax tones and
configuring their G.711 tasks to transmit and receive fax reliably.
SIP G.711 operational parameters
Some fax machines cannot successfully send faxes over VoIP trunks to the
following destinations:
CallPilot mailboxes
CallPilot mailboxes accessed through auto-attendant
Fax Transfer (calls transferred to a system fax device through the auto-
attendant)
Use the following tips to avoid this problem:
Avoid using manual dial on the originating fax machine. In some fax
machines, dialing manually results in a much shorter call time-out.
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