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TekSIP is a SIP Registrar and Stateless SIP Proxy for Windows. You can use freeware version for both commercial and personal use. 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 and alternative SIP endpoints for outgoing calls.

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