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Chapter 47 T.38 fax 427
BCM 4.0 Networking Configuration Guide
Figure 136 Media Gateways panel
T.38 Fax restrictions
Voice mail, IVR, and T.38 FoIP share a maximum of eight fax ports. Voice mail supports only two
fax ports.
If you allow fax messaging for the local VoIP gateway, you must be aware of the guidelines in
“Operational notes and restrictions” on page 427 when you send and receive fax messages over
VoIP trunks. For more information, see “VoIP trunk gateways” on page 401.
Operational notes and restrictions
Some fax machines cannot send faxes successfully over VoIP (T.38) 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:
Note: For more details and instructions on how to configure media
gateways, see “Media Gateways” on page 445.
Note: Fax tones that broadcast through a telephone speaker can disrupt calls on other
telephones using VoIP trunks near the fax machine. Follow these suggestions to reduce the
chance of your VoIP calls being dropped because of fax tone interference:
Locate the fax machine away from other telephones.
Turn the speaker volume on the fax machine to the lowest level, or off.
Note: Fax tones can be recorded in a voice mail box. In the rare event that fax tones are
captured in a voice mail message, opening that message from a telephone using a VoIP
trunk can cause the connection to fail.
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