| 摘要 |
In the field of Session Initiation Protocol (SIP) transactions, it is desirable to obtain diagnostic information concerning SIP transactions, for example, times of transmission or receipt of SIP messages. However, messages forming parts of transactions can be routed via a number of different paths through a series of servers in a communications network and it is desirable to obtain measurement data from one or more or the servers. Consequently, the present invention provides a method of monitoring progress of a signalling message over a message sequence path that analyses Via object data (1010) stored in SIP messages (1002) to determine a path taken by a given message and obtaining measurement data from at least one server (1000) in the path identified.
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