
Chapter 44 VoIP trunk gateways 413
BCM 4.0 Networking Configuration Guide
• 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.
• The call duration can be increased by adding a timed pause to the end of dialing string (for
example: 758-5428,,,,). This allows the call to ring at the destination before the fax
machine call duration timer starts.
• Since the problem is related to the delay in initiating the fax session, the number of rings
for fax mailboxes Call Forward No Answer (CFNA) should be minimized.
Table 95 is a list of restrictions and requirements for the T.38 fax protocol.
Table 95 T.38 restrictions and requirements
Supported Not supported
only UDP transport TCP
only UDP redundancy Forward Error Correction (FEC)
T.38 version 0 Fill removal
on H.323 VoIP trunks between BCMs, between
BCMs and legacy BCMs, or between BCM and
Meridian 1-IPT and CS 1000/M
MMR transcoding
JBIG transcoding
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