Re: On TD26 - Fast TCS and M/S negotiation in H.323v4

5.8.6.2/Q.931: When a SETUP or RELEASE message is received which has one or more mandatory information elements with invalid content, a RELEASE COMPLETE message with cause No. 100, “invalid information element contents” shall be returned."

My understanding of this statement is that it is meant to cover Q.931 elemements themselves, NOT UUIE content. As far as Q.931 is concerned, the User-user information element can be coded in whatever way we want. It is an ISDN thing that was carried over in H.225.0.

So, my take is that this section is completely irrelevant to the H.245 tunnelling (or in fact H.245 in general). Also, it talks about a message (RELEASE) that is not even supported in H.225.0.