GNU implementation of SIP (RFC3261)
oSIP provides a SIP stack with a limited set of features common to any kind of SIP Agents. Thus oSIP is not oriented towards any particular implementations and can be used for implementing SIP End-Point, Proxy or any kind of more specific SIP Agent such as B2BUA. Documentation is only available online.
Homepage: https://www.gnu.org/software/osip/
Maintainer: Christian Weisgerber <naddy@openbsd.org>