This is the reference to the IPsec tunnel instance used by the UMTS FAP. The {{param}} MUST point to an IPsec tunnel instance defined in {{bibref|TR-181i2}}. This is the reference to an IPsec tunnel instance used by the LTE FAP. The {{param}} MUST point to an IPsec tunnel instance defined in {{bibref|TR-181i2}}. This is the reference to the IPsec tunnel instance used by the CDMA2000 FAP. The {{param}} MUST point to an IPsec tunnel instance defined in {{bibref|TR-181i2}}.