I know you want to decrease the delay. I was just explaining the purpose of the parameter on the Line Port. On an SIP trunk the CallerID is transmitted first, so there is no need for this parameter on a SP line.
I understand, so the reason there is no ring delay adjustment on the Obi100 is that there is no ring delay as the 100 is an SP only device, so it must be a network problem.
Thanks for the clarification.