).
?– End of SUBSCRIBE dialog Indicates the closure of a SUBSCRIBE dialog.
?– 3xx redirection Indicates a transaction was terminated due to a 3xx response.
?– Unspecified error Indicates the SIP transaction was terminated due to some error,
but the error cannot be identified.
?– 4xx response failure Indicates the SIP transaction was terminated because an
IMS node received a 4xx response.
?– 5xx server failure Indicates the SIP transaction was terminated because an IMS
node received a 5xx response.
?– 6xx global failure Indicates the SIP transaction was terminated because an IMS
node received a 6xx response.
?– Unsuccessful session setup Indicates the session was not set up successfully.
?– Internal error Indicates the session was terminated due to an internal error in
the IMS node.
Content-disposition Defines how a SIP message body is to be interpreted. For example,
the message body identifies the parameters of a session, or the message body
contains a text message.
Content-length Identifies the size of the SIP message body, if user data is being
exchanged in the SIP message body. This information can then be used to determine
billing for data such as text messaging.
Content-type Identifies whether the message body is text or contains an SDP, for
example.
Direction Identifies the direction of the user-to-user data, with two possible values:
?– Uplink = 0
?– Downlink = 1
Use of this information will vary, but it can be applied to rate plans.
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