Force, August 2005. 94. Alexander, S. and Droms, R. DHCP Options and BOOTP Vendor Extensions. RFC 2132, Internet Engi- neering Task Force, March 1997. 95. Schulzrinne, H. Dynamic Host Configuration Protocol (DHCP-for-IPv4) Option for Session Initiation Protocol (SIP) Servers. RFC 3361, Internet Engineering Task Force, August 2002. 96. Droms, R. DNS Configuration options for Dynamic Host Configuration Protocol for IPv6 (DHCPv6). RFC 3646, Internet Engineering Task Force, December 2003. 97. Schulzrinne, H. and Volz, B. Dynamic Host Configuration Protocol (DHCPv6) Options for Session Initi- ation Protocol (SIP) Servers. RFC 3319, Internet Engineering Task Force, July 2003. 98. GSMA,. Inter-Service Provider IP Backbone Guidelines. PRD IR.34 5.0, GSM Association (GSMA), December 2010. 99. GSMA,. GSMA PRD IR.88 'LTE Roaming Guidelines'. PRD IR.88 6.0, GSM Association (GSMA), August 2011. 100. 3GPP. Technical realization of Operator Determined Barring (ODB). TS 23.015, 3rd Generation Partner- ship Project (3GPP), December 2009. 101. 3GPP. Telecommunication management; Charging management; Charging data description for the Packet Switched (PS) domain. TS 32.215, 3rd Generation Partnership Project (3GPP), June 2005. 102. Perkins, C., Johnson, D., and Arkko, J. Mobility Support in IPv6. RFC 6275, Internet Engineering Task Force, July 2011. 103. 3GPP. 3GPP system to Wireless Local Area Network (WLAN) interworking; System description. TS 23.234, 3rd Generation Partnership Project (3GPP), December 2009. 104. 3GPP. Mobility between 3GPP Wireless Local Area Network (WLAN) interworking (I-WLAN) and 3GPP systems; General Packet Radio System (GPRS) and 3GPP I-WLAN aspects; Stage 3. TS 24.327, 3rd Generation Partnership Project (3GPP), June 2010. 105. 3GPP. 3GPP system to Wireless Local Area Network (WLAN) interworking; WLAN User Equipment (WLAN UE) to network protocols; Stage 3. TS 24.234, 3rd Generation Partnership Project (3GPP), September 2011. 106. 3GPP. Study on S2a Mobility based on GTP & WLAN access to EPC. TR 23.852, 3rd G