Avaya Business Communications Manager 5.0 - Planning and Engineering User Manual Page 304

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304 SIP fax over G.711 specifications
Nortel Business Communications Manager 5.0
Planning and Engineering
NN40170-200 01.03 Standard
August 2009
Copyright © 2009 Nortel Networks
If you allow fax messaging for the local VoIP gateway, you must be aware of
the guidelines in Operational notes and restrictions (page 304) when you
send and receive fax messages over VoIP trunks. For more information, see
VoIP trunk gateways (page 185).
Operational notes and restrictions
Some fax machines cannot successfully send faxes over VoIP trunks to the
following destination:
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.
If you must dial manually, wait until the call is answered before you start
the fax session.
For Mailbox Call Answering only, if you must dial manually, enter the digit
8 as soon as you hear the mailbox greeting. This ensures that CallPilot
initiates the fax session before the fax machine timer starts.
Attention: Enter the digit 8 for Norstar Voice Mail User Interface (NVMUI)
only. To enable fax call answering when using CallPilot User Interface
(CPUI), enter 707.
Increase the call duration by adding a timed pause to the end of the dialing
string. This addition allows the call to ring at the destination before the fax
machine call-duration timer starts. Refer to your fax machine
documentation for more information on how to insert pauses into dial
strings.
Because the problem is related to the delay in initiating the fax session,
reduce the number of rings for fax mailboxes Call Forward No Answer
(CFNA).
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