tokens: ['reason', 'why', 'the', '', 'intercepted', 'call', 'cannot', 'be', 'established', 'or', 'why', 'the', 'intercepted', 'call', 'has', 'been', '', 'released', 'after', 'the', 'active', 'phase', 'natureOfTheinterceptedcall', '', 'ENUMERATED', '', 'Not', 'required', 'for', 'UMTS', 'May', 'be', 'included', 'for', 'backwards', 'compatibility', 'to', 'GSM', 'Nature', 'of', 'the', 'intercepted', 'call', 'gSMISDNPSTNcircuitcall', '', 'the', 'possible', 'UUS', 'content', 'is', 'sent', 'through', 'the', 'HI', 'or', 'HI', 'data', 'interface', '', 'the', 'possible', 'call', 'content', 'call', 'is', 'established', 'through', 'the', 'HI', 'circuit', 'interface', 'gSMSMSMessage', '', 'the', 'SMS', 'content', 'is', 'sent', 'through', 'the', 'HI', 'or', 'HI', 'data', 'interface', 'uUSMessages', '', 'the', 'UUS', 'content', 'is', 'sent', 'through', 'the', 'HI', 'or', 'HI', 'data', 'interface', 'tETRAcircuitcall', '', 'the', 'possible', 'call', 'content', 'call', 'is', 'established', 'through', 'the', 'HI', 'circuit', 'interface', '', 'the', 'possible', 'data', 'are', 'sent', 'through', 'the', 'HI', 'data', 'interface', 'teTRAPacketData', '', 'the', 'data', 'are', 'sent', 'through', 'the', 'HI', 'data', 'interface', 'gPRSPacketData', '', 'the', 'data', 'are', 'sent', 'through', 'the', 'HI', 'data', 'interface', '', '', 'OPTIONAL']