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MultiVOIP User Guide T1 PhoneBook Configuration
243
PhoneBook Configuration Parameter Definitions
(cont’d)
Field Name Values Description
H.323 Version 4 Parameters
Parallel H.245
(FS + Tun)
Y/N
FS (Fast Start or Fast Connect)
is a Q.931 feature of H.323v2 to
hasten call setup as well as
‘pre-opening’ the media
channel before the CONNECT
message is sent. This pre-
opening is a requirement for
certain billing activities.
Under Parallel H.245 FS + Tun,
this Fast Connect feature can
operate simultaneously with
H.245 Tunneling (see
description above).
Annex –E (AE) Y/N
Multiplexed UDP call
signalling transport. Annex E
is helpful for high-volume voip
system endpoints. Gateways
with lesser volume can afford
to use TCP to establish calls.
However, for larger volume
endpoints, the call setup times
and system resource usage
under TCP can become
problematic. Annex E allows
endpoints to perform call
signalling functions under the
UDP protocol, which involves
substantially streamlined
overhead. (This feature should
not be used on the public
Internet because of potential
problems with security and
bandwidth usage.)