Message structure and function 4-11
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Table 4-1
Q.931 message descriptions
(continued)
Message Event informationDirectionMeaning
NOTIFY Notify Sent by either PBX user to the
network and by the network to
the calling user to convey
information across the PRI
interface.
Like the ALERT message, the
NOTIFY message is sent to a
PBX only when received from
the opposite PBX. The
MSL-PBX determines when
the NOTIFY message is sent.
Used by the network to notify
the end users of the transfer.
The appropriate description
“call transfer-alerting” or “call
transfer-active” contained in the
notification indicator
information element may be
sent to a user on a call with the
transferring user.
The NOTIFY message carrying
the transfer notification is not
delivered to the user that was
alerting after the transfer. The
message is delivered after the
user answered the transferred
call.
—continued—
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