Operational Notes And Restrictions - Nortel BCM50 Configuration Manual

3 BCM 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 BCM Ottawa sends an ARQ to the gatekeeper for DN 421.
2 The gatekeeper resolves DN 421 to 10.10.10.17.
3
BCM 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 trunks: You can assign VoIP trunks to wired fax machines if you have
T.38 fax enabled on the local gateway. The BCM supports this IP fax feature between BCMs,
BCM200/400/1000 running BCM 3.5 and subsequent up-level versions of software, and a
Meridian 1 running IPT 3.0 (or newer) software, or a CS 1000/M.
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. Both the endpoints must be running a software version that
supports the T.38 fax.
Caution: Operations note: Fax tones that broadcast through a telephone speaker may
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:
•
•
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.
For a list of limitations and requirements for using T.38 fax, refer to
restrictions" on page

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:
Locate fax machine away from other telephones.
Turn the speaker volume on the fax machine to the lowest level, or off.
379.
Chapter 43 VoIP trunk gateways
"Operational notes and
Networking Configuration Guide
379