[VOIPSEC] Are there any SIP client and proxy server that supports IPSec or transport layer security ( hop-by-hop protection)?

[dennis]

I intend to start a project(client) that will
implement TLS, IPsec(secure SIP) and secure RTP. I'm
surveying the products(client and server) that support
TLS or IPsec. But 
I don't find any SIP client product that support TLS
or IPsec. Does anyone know such SIP security products ?

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