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Chapter 5 Configuring local VoIP trunks 91
IP Telephony Configuration Guide
Setting up the local gateway
The call signaling method used by the local gateway defines how the Business Communications
Manager prefers call signaling information to be directed through VoIP trunks. Call signaling
establishes and disconnects a call. You set this information in the local gateway screens.
(“Modifying local gateway settings for H.323 and SIP trunks”)
If the network has a gatekeeper (H.323 trunks, only), The Business Communications Manager can
request a method for call signaling, but whether this request is granted depends on the
configuration of the gatekeeper. Ultimately, the gatekeeper decides which call signaling method to
use. Refer to “Using a gatekeeper” on page 133.
Jitter Buffer - Voice Auto
None
Small
Medium
Large
Select the size of jitter buffer you want to allow for your
system.
Refer to “Jitter Buffer” on page 28.
T.38 Fax Support Enabled
Disabled
Note: This field appears on H.323 screens only, as SIP
trunks do not support this feature.
Enabled: The system supports T.38 fax over IP.
Disabled: The system does not support T.38 fax over IP
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, if that option is available.
G.729 Payload Size
(ms)
10, 20, 30, 40, 50,
60
Default: 30
Set the maximum required payload size, per codec, for the
VoIP calls sent over H.323 trunks.
Note: Payload size can also be set for Nortel IP telephones.
Refer to “Setting IP terminal general settings” on page 43.
G.723 Payload Size
(ms)
30
G.711 Payload Size
(ms)
10, 20, 30, 40, 50,
60
Default:30
Table 22 Media parameters record (Continued)
Field Value Description
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