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Technical Configuration MultiVOIP User Guide
112
H.323 Call Signaling Parameter Definitions
(cont’d)
Field Name Values Description
H.323 Version 4 Parameters
H.323
Multiplexing
(Mux)
Y/N Signaling for multiple phone
calls can be carried on a single
port rather than opening a
separate signaling port for
each call. This conserves
bandwidth resources.
H.245
Tunneling
(Tun)
Values: Y/N
Description: H.245 messages are
encapsulated within the Q.931 call-signaling
channel. Among other things, the H.245
messages let the two endpoints tell each other
what their technical capabilities are and
determine who, during the call, will be the
client and who the server. Tunneling is the
process of transmitting these H.245 messages
through the Q.931 channel. The same TCP/IP
socket (or logical port) already being used for
the Call Signaling Channel is then also used
by the H.245 Control Channel. This
encapsulation reduces the number of logical
ports (sockets) needed and reduces call setup
time.