About UAC and Soft-Phone

Hello,

In RFC3261, UAC is defined as: User Agent Client (UAC): A user agent client is a 
logical entity that creates a new request, and then uses the client transaction
state machinery to send it.  The role of UAC lasts only for the duration of that 
transaction.  In other words, if a piece of software initiates a request, it acts
as a UAC for the duration of that transaction.  If it receives a request later, it
assumes the role of a user agent server for the processing of that transaction.

So, it is the soft-Phone that performs the function of UAC, right? That is, UAC
and UAS are the major part of the soft-phone rather than SIP stack.

Can anyone give me some infomation?

Thanks,
Zhenyu


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