This option specifies whether or not the DUT supports SIP ALG or proxy functionality. This option should be enabled if the DUT supports SIP ALG functionality and disabled otherwise. In either case, CDRouter will create a SIP server on the WAN and one or more SIP clients on the LAN and establish SIP connections between them. CDRouter will verify that header information is appropriately changed if SIP ALG is enabled and will verify that the header information is not changed if it is not enabled. Some SIP module tests that require that SIP ALG is enabled will be skipped when this testvar is set to no.