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Can VoIP be integrated with 3GSM or WCDMA?

Can VoIP be integrated with 3GSM or WCDMA?

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There are already a number of endpoint devices that are capable of supporting WiFi and GSM.

http://www.motorola.com/wlan/docs_pdf/cn62mod.pdf

http://www.gizmodo.com/gadgets/cellphones/nec/docomo-nec-900il-025631.php

These phones support SIP for VoIP when in range of a WiFi network and also support GSM.

This was first published in July 2005