ReSIProcate
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reSIProcate is an open-source Session Initiation Protocol (SIP) stack, written in C++. The reSIProcate project also contains a Dialog layer intended for use by endpoints and B2BUAs (Dialog-Usage Manager, or DUM), and a transaction-stateful SIP Proxy/Registrar (repro). There is an error in the sipphone page: this is not for Windows