SipWanIpAddressChange

The SipWanIpAddressChange event is sent to an application when the media engine detects that the "telephony system" Wan IP address has changed. In order for an application to receive this event, the application must be deployed and registered with a LanScape proxy/registrar solution.

Generally speaking, a LanScape proxy/registrar would be deployed behind a NAT router in the DMZ of the telephony system's network configuration. The proxy registrar could also be placed on any machine in the telephony system's private network with the appropriate NAT router port forwarding configuration. A LanScape proxy/registrar solution would then be configured to monitor the Wan IP address of the "telephony system".

In addition, telephony applications in the private "telephony system's" network can optionally be behind their own NAT router configurations to further sub-net the telephony installation.

When an application receives this event, the media engine event callback procedure SIPCALLBACKPROC will have a non zero value assigned for the pEventData parameter. This value is a pointer to the WAN_IP_NOTIFICATION structure which contains additional information for this event.