4-22 Message structure and function
297-2521-106 Standard 23.01 March 2001
Table 4-3
Q.932 message descriptions
Message Meaning Direction Event information
FACILITY Facility Sent by a user to a network to
request the supplementary
service or from the network to
the user to respond to a
request. This message is used
by the transferring user to
invoke network call transfer.
Network dependent. Refer to
the appropriate network profile
supplement to determine what
level of message is supported
and what additional information
elements are used.
REGISTER Register Initiates a transaction Network dependent. Refer to
the appropriate network profile
supplement to determine what
level of message is supported
and what additional information
elements are used.
—end—
Q.932 message information elements
Table 4-4 lists the information elements for supported Q.932 messages.
Table 4-4
Q.932 message information elements
Q.932
message
Information element Direction Type
FACILITY Protocol discriminator Both Mandatory
Call Reference Both Mandatory
Message Type Both Mandatory
Facility Both Mandatory
REGISTER Protocol discriminator Both Mandatory
Call reference Both Mandatory
Message type Both Mandatory
—end—
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