Avaya IP Telephony Průvodce konfigurací stáhnout pdf (Strana 142)

142 Chapter 7 Optional VoIP trunk configurations

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Faxing over VoIP lines

You can assign VoIP trunks to wired fax machines if you have T.38 fax enabled on the local

gateway. The Business Communications Manager supports this IP fax feature between Business

Communications Managers running BCM 3.5 or newer software, and between a Business

Communications Manager running BCM 3.5 or newer software and a Meridian 1 running IPT 3.0

(or newer) software.

The system processes fax signals by initiating a voice call over the VoIP line. When the T.38 fax

packets are received at the remote gateway, the receiving system establishes a new path that uses

the T.38 protocol.The remote gateway, and any nodes between the two endpoints, must be running

BCM version 3.5 or newer software and have T.38 fax enabled on the system. Refer to “Setting up

the local gateway” on page 91.

For a list of limitations and requirements for using T.38 fax, refer to “T.38 fax restrictions and

requirements” on page 189.

Operational notes and restrictions

Some fax machines will be unable to successfully send faxes 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:

• Avoid the use of manual dial on the originating fax machine. In some fax machines, manually

dialing introduces a much shorter call time-out.

• If manual dial must be used, then the user should wait until the call is answered before starting

the fax session.

• If manual dial must be used, then the user should enter the digit 8 before initiating the fax

session. This ensures that the fax session is initiated by CallPilot before the fax machine's

timer is started.

Caution: Operations note: Fax tones that broadcast through a telephone speaker will

disrupt calls at other telephones using VoIP trunks in the vicinity of the fax machine. Here

are some suggestions to minimize the possibility of your VoIP calls being dropped

because of fax tone interference:

• Locate fax machine away from other telephones.

• Turn the speaker volume on the fax machine to the lowest level, or off.

Fax tones recorded in a voice mailbox: In the rare event that fax tones are captured in a

voice mail message, opening that message from an telephone using a VoIP trunk will

cause the connection to fail.

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