You could have downloaded Go4SIp 4.0.0.3 from our software library for free. The most frequent installer filename for the software is: Go4SIp.exe. The most popular versions of the program are 4.0 and 1.0. The software lies within Communication Tools, more precisely Instant messaging. The actual developer of the free program is Go4SIp.
From the developer:
Go4sip is one of the leading Voip (voice over internet protocol) service provider. Go4sip makes it fun to all your loved ones around the world to more than 100 entire countries for less than ever, with consistently high quality voip call service through our agent and reseller.
You may want to check out more software, such as South Park Theme Pack for Messenger, TapiRex Plugin: Solutio Charly or Simpsons Theme Pack for Messenger, which might be related to Go4SIp.