Sipdialer is a click-to-call application that uses the SIP REFER method to force a SIP phone (for example, the phone on your desk) to dial another number. It can be registered in GConf to handle clicks on sip:, sips: and tel: URIs in other applications and the web browser.

reSIProcate is a framework that aims to fully implement the SIP protocol in first class C++. It is intended for use in other applications, such as the repro SIP proxy.