This option specifies the network interface CDRouter will use for its SIP server. Other WAN interfaces may be present when running the CDRouter Multiport Add-On - wan2, wan3, etc. By default, CDRouter will use the remote host on the primary WAN interface for its SIP server. If this testvar is not “wan”, CDRouter will create a SIP server on the given WAN interface with an IPv4 address specified by the testvar sipServerIp and an IPv6 address specified by the testvar ipv6SipServerIp.
This testvar was added in CDRouter 9.2