The emergence of mobile phones with integrated 802.11 chipsets lead to the idea of replacing GSM calls with VOIP calls. Mutual authentication using EAP-TLS based protocols allows to automatically authenticate embedded devices at public wireless hotspots, which is one of the prerequisites in order to have a comfortable GSM-like 802.11 based setup. This work proposes a possible accounting and roaming scheme and discusses seamless handovers in EAP-TLS authenticated networks. It shows that EAP-TLS authenticated VOIP setups provide even more comfort for the user than GSM networks since there is the possibility to have one identity for every different operator that controls the hotspots.
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