TekSIP is a SIP Registrar and Proxy. TekSIP tested on Microsoft Windows (Vista, Windows 7/8/10, 2008-2016 Server). TekSIP complies with RFC 3261, RFC 3263, RFC 3311, RFC 3581 and RFC 3891. It supports NAT traversal, UPnP and ENUM. Please see technical details about NAT traversal in Readme.txt. You can select IP address to be listened, alternative SIP routes for outgouing calls. TekSIP has a Presence Server (SIP/SIMPLE based). You can also log session details and errors into a log file. TekSIP supports RADIUS Authentication (RFC 2865) and RADIUS Accounting (RFC 2866). TekSIP can optionally act as a B2BUA for incoming 3xx SIP responses. TekSIP can act as RTP Proxy and record auido treams if RTP proxy is enabled. TekSIP can register to upstream SIP servers to receive incoming calls. TekSIP monitors failed registration and call attempts from suspicious endpoints and blacklists them. You can monitor black listed endpoints through TekSIP Manager and you can remove black listed endpoints from quarantine list if required. You can also ban specific user agents. TekSIP runs as a Windows service. TekSIP supports auto provisioning of IP phones based on SUBSCRIBE / NOTIFY PnP mechanism. You can deploy TekSIP as a proxy for standard SIP phones to connect to a Microsoft Lync system. Lync supports IP phones only if they support SRTP with SIP TLS transport. TekSIP register standard SIP phones on behalf of them to a Lync system and maintain their presence status.
o quick to download, and install (.NET framework needed)
o very easy to configure
o easy to understand, quick feedback of registered SIP phones
o functional SIP proxy + registrar
o FREE for private AND comercial use!
(so far I haven't found any defect)
Compared to other free SIP proxy and registrar tools this one will surely be a very good choice, if what you want is to get a SIP proxy quickly installed and running in order to route VoIP calls.
I had it downloaded, installed, and configured in about 5 minutes only!
And I do also like the easy to understand GUI, which lets you easily configure which IP to use for the proxy, as well as it gives instant feedback on which SIP agents/ VoIP phones are currently registered and when their registration expires.
And it's free! Thanks a lot to the author Yasin Kaplan for providing this to the community!