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MultiVOIP User Guide T1 PhoneBook Configuration
287
PhoneBook Configuration Parameter Definitions
(cont’d)
Field Name Values Description
H.323 Version 4 Parameters
Parallel H.245
(FS + Tun)
Values: Y/N
Description: 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) Values: Y/N
Description: 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.)