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In Mobile Communication have have 3 access networks. GERAN is the oldest one and it is used for circuit switch voice transmission but also for Packet Switched transmission(GPRS,EDGE)

Than we have UTRAN. Its used by UMTS and HSDPA. My Question now. Is UTRAN today used for old-fashion voice calls (not talking about SIP or something else)? or is it a data trasmission only network.

(by the way the third is E-UTRAN for LTE.)

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Well, i think UMTS is used only for datatransmission. – Rob Anderson Jul 20 '12 at 18:09
What do you mean by "voice transmission"? UTRAN is able to use both CS and PS. Basically CS would in your world be "old-fashioned voice calls", typically E1s in a C7 net. E-UTRAN is PS only. – Andy Thompson May 16 '13 at 10:57

The UTRAN is designed for voice and data. There are various additions to it, like HSDPA, HSUPA and HSPA+ that deliver faster data.

I think the question about whether the UTRAN is used for voice calls depends purely on the relative number of voice and data calls in a particular area at a particular time. It would make sense to divert voice calls to the GSM network and data calls to UMTS by preference.

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