NAT_BINDING_METHOD specifies how a softphone will update UDP hole, which is opened through NAT router.
It may have following values:
- 0 - none (don't use NAT binding)
- 1 - send periodically OPTIONS message to the server (recommeded)
- 2 - send empty UDP message
Updating of UDP hole is necessary, if the softphone may receive incoming calls.
If the softphone makes only outgoing calls, then this feature is not important.
NAT_BINDING_TIMEOUT specifies how often update is done. The value is set in milliseconds. For example, 60000 is one minute, 360000 is 6 minutes.
Example:
!define NAT_BINDING_METHOD 1
!define NAT_BINDING_TIMEOUT 60000