SIP returns are affected via the overall performance in the underlying investment instrument. In excess of the long term, SIPs contain the potential to generate interesting returns, especially when invested in fairness-dependent funds, but it's important to notice that returns are subject to sector fluctuations. A VoIP cell phone services http://buzzgram.de/die-evolution-der-kommunikation-eine-einfuhrung-in-sip-trunking-voip-handys-softphones-und-voip-telefonanlagen/