3.2.3.1.7 Table of Active Calls per Activity

Table of Active Calls per Activity: The server maintains a table of active calls per activity. Each call is indexed by the call sequence number, as specified in [C706] section 9.5.3. In general, calls are removed from the table when the call transitions to STATE_COMPLETE. Calls are also removed from the Table of Active Calls per Activity if they have been idle for more than an implementation-specific period of time. See Idle Scavenger Timer for details on idle call removal. A new entry is added to the table when a new call arrives with a sequence number greater than or equal to the Lowest-Unused-Sequence Counter for the activity.

There is no provision for overflow of sequence numbers sent by the client. If the sequence number wraps around, the server will not create a new entry and in such a case will result in discarded packets as described in section 3.2.3.5.4. A client interacting with a server MUST NOT wrap around the sequence number on a specific activity.