Last week I went through the mechanisms described in H.225 to associate messages, calls and conferences. The thing that struck me as being odd was that only some of the RAS request messages (i.e. ARQ, BRQ and DRQ) carry a call reference and a call identifier. It would seem appropriate to only use these values in "call associated" messages, hence some of the request messages do not carry these elements (GRQ, RRQ, URQ, IRQ, LRQ) but why do I not see these elements in the response messages? How am I supposed to associate an ARQ with an ACF/ARJ? If this is done by some other means than the CRV, then this element should be removed.

Frank

----------------------------------------------------- Frank Derks |Tel +31 35 6893238 | Advanced Development |Fax +31 35 6891030 | Philip Business Communications |P.O. Box 32 | |1200 JD Hilversum | |The Netherlands | ----------------------------------------------------| E-mail: mailto:f.derks@pbc.be.philips.com | WWW: http://www.business-comms.be.philips.com | -----------------------------------------------------