: §8 A single user agent may act as both UAC and UAS for different transactions: : p26 for example, a SIP phone is a user agent that will be a UAC when making a call, and a UAS when receiving one. SIP requests and responses may be generated by any SIP user agent user agents are divided into clients (UACs), which initiate requests, and servers (UASes), which respond to them. Each transaction consists of a SIP request (which will be one of several request methods), and at least one response. SIP is based on request/response transactions, in a similar manner to the Hypertext Transfer Protocol (HTTP). The Session Initiation Protocol (SIP) is a signalling protocol used for controlling communication sessions such as Voice over IP telephone calls.
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