FIG 5 illustrates an embodiment with a dual mode SGSN, here denoted {HEAD ~ old SGSN}, which supports access over WCDMA as well as GSM/GPRS, i.e. it shows an IRAT PS handover or an intra SGSN WCDMA to GSM/GPRS handover with only of those parts of {TAIL ~ the execution phase} which are necessary for carrying out the inventive concept 
FIG 5 illustrates an embodiment with a dual mode SGSN , here denoted { HEAD ~ old SGSN } , which supports access over WCDMA as well as GSM / GPRS , i.e. it shows an IRAT PS handover or an intra SGSN WCDMA to GSM / GPRS handover with only of those parts of { TAIL ~ the execution phase } which are necessary for carrying out the inventive concept
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