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MultiVOIP User Guide Technical Configuration
113
H.323 Call Signaling 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.)