TekSIP

TekSIP complies with RFC 3261, RFC 3263, RFC 3311, RFC 3581 and RFC 3891. It supports NAT traversal and ENUM. Please see technical details about NAT traversal in Readme. You can select IP address to be listened and alternative SIP endpoints for outgoing calls. You can also log session details into a log file and monitor active registrations and sessions in real-time. You can monitor number of active registrations and sessions using Windows Performance Monitor (Perfmon.exe). TekSIP can redirect calls to alternate endpoint when called endpoint is unavailable (Off-line, busy...). Active SIP session can be terminated via GUI. TekSIP has a Presence Server (SIP/SIMPLE based).

TekSIP also supports UPnP IGD specification. If installed behind UPnP supported Internet gateway device (ADSL router e.g.), TekSIP automatically detects if it is behind a new NAT gateway and the external IP address. All outgoing requests manipulated for NAT traversal. You do not need to add manual reverse mappings for SIP and RTP protocols. TekSIP has also a built-in STUN server. TekSIP supports auto provisioning of IP phones based on SUBSCRIBE / NOTIFY PnP mechanism.

TekSIP can optionally act as a B2BUA for incoming 3xx SIP responses. TekSIP can also act as a RTP Proxy and record audio streams if RTP proxy enabled. Recorded audio streams are saved in wave format can be played using TekSIP Manager. RADIUS Authentication (RFC 2865) and Accounting (RFC 2866) are supported. RADIUS authorization is available in only SP edition of TekSIP. TekSIP accepts RADIUS disconnect requests as specified in RFC 5176.

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 also provides single accounts proxy; if you have just one provider account and many internal clients, TekSIP proxies all external calls for the provider account. TekSIP can register to upstream SIP servers to receive incoming calls.

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.