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E1 Phonebook Configuration MultiVOIP User Guide
336
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 signaling
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-
signaling 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.)