Phones such as the NEC N900iL, many of the Nokia Eseries and several other Wi-Fi enabled mobile phones have SIP clients built into the firmware. Such clients operate independently of the mobile phone network (however some operators choose to remove the client from subsidised handsets). Some operators such as Vodafone actively try to block VoIP traffic from their network.
There are two main benefits of VOIP technology:
>Operational cost:
VoIP can be a benefit for reducing communication and infrastructure costs.
>Flexibility:
VoIP can facilitate tasks and provide services that may be more difficult to implement using the PSTN.
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