Not to be a pain about this but trying to be helpful… what is the SIP Settings IP entries use in a DDNS environment, except to be confusing. Where is the operative IP address for the box displayed?
I assume the Sys Admin / DDNS display is simply the current DDNS “service” address. In SIP Settings / Chan SIP the DDNS name is entered and it is assumed this keeps the box IP up to date but how often and how can its operation be monitored / verified.
If the SIP service address is being updated behind the scenes, why not update it in SIP Settings to avoid confusion. Otherwise one can look at that address and think there is a problem updating the box IP address.
Where is all this explained? Am I wrong to think there are some unobvious aspects?