There are
several events identified in this parameter:
?– Change_in_SGSN_IP_address
?– Change_in_QoS
Online and Offline Charging in the IMS 197
?– Change_in_location
?– Change_in_RAT (radio access technology)
Trunk-group-ID This AVP consists of two trunk group identifiers, the outgoing and
the incoming. They are identified in the following AVPs:
?– Incoming-trunk-group-ID
?– Outgoing-trunk-group-ID
User-name AVP The user name in this case is the private user identity provided
by the network element if it is available. It is only used for offline charging in the IMS
domain.
User-session-ID The session ID in a SIP session is the CALL ID derived from the
SIP message.
UUS-data This contains information about user-to-user data that was sent; it consists
of the following values:
?– Amount-of-UUS-data
?– Mime-type
?– Direction
Vendor-ID In the case of IMS, the vendor ID carries a value of 10415, indicating
???3GPP.??? This AVP is found in the Vendor-specific-application-ID message. This AVP is
only used for offline charging in an IMS domain.
Volume-quota-threshold Like the Time-quota-threshold, this AVP is used to identify
the number of octets allotted for a session under credit control (prepaid). When the
quota threshold has been exceeded, the network element must query the OCS for additional
authorization (and an additional quota) or terminate the session.
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