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UMTS network has insular covering within GSM network, but for uninterrupted supply of the connection on the cover zones’ boards GSM-UMTS transition is provided.
All UMTS terminals support GSM standard. It means, that subscriber can get usual service while traveling from UMTS to GSM network without interruptions. But within video call fulfillment in UMTS network and following passing into GSM network, video call will be broken, because GSM network doesn’t support them.
UMTS network application is directed to subscribers’ service quality improvement. Combination of networks of 2G and 3G generations will greatly widen potential of mobile communication for our subscribers.