Dear Paul, Question 1: This is specifically in regards to call clearing in which both endpoints have pregranted ARQs and the call is GK routed. If the GK closes the call signalling channel, how would the GK know of the call clearing? possibilities : a) both endpoints send a DRQ (even if they have pregranted ARQ). b) GK peeps into the H.245 channel and treats the EndSessionCommand as the request for call clearing. c) (Assuming that GK has requested for IRRs.) On detection of 'n' missed IRRs, the GK decides to poll the endpoint and gets no answer or negative answer, Gk assumes that the call has been released. (But it may have serious implications on billing.) Question 2: If the possibility (a) is TRUE, is the DRQ mandatory for a registered endpoint whether it has sent ARQ or not and whether it sends a subsequent RELEASE COMPLETE or not. Question 3: If the possibilty (c) is TRUE, should it not be mandatory to specify irrFrequencyInCall in either ACF or RCF, if the GK does not want to retain the call signaling channel? With regards, Sunil Chandra Hughes Software System