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134 Chapter 7 Optional VoIP trunk configurations

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This example explains how a call from DN 321 in Ottawa would be made to DN 421 in Santa

Clara. It assumes that call signaling is set to Gatekeeper Resolved and no pre-granted ARQ has

been issued:

1 Business Communications Manager Ottawa sends an AdmissionRequest (ARQ) to the

gatekeeper for DN 421.

2 The gatekeeper resolves DN 421 to 10.10.10.19 and returns this IP in an AdmissionConfirm to

the Business Communications Manager Ottawa.

3 Business Communications Manager Ottawa sends the call Setup message for DN 421 to the

gateway at 10.10.10.19, and the call is established.

If call signaling is set to Gatekeeper Routed and no pre-granted ARQ has been issued:

1 Business Communications Manager Ottawa sends an AdmissionRequest to the gatekeeper for

DN 421.

2 The gatekeeper resolves DN 421 to 10.10.10.17.

3 Business Communications Manager Ottawa sends the call Setup message for DN 421 to the

gatekeeper (10.10.10.17), which forwards it to the gateway at 10.10.10.19.

4 The call is established.

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 later software, and between a Business

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

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 software and have T.38 fax enabled on the system. Refer to “Setting up the local

gateway” on page 87.

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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Avaya IP Telephony Guía de configuración Pagina 134