Paul,
The CHOICE, UserInputIndication.userInputSupportIndication.basicString, means that a UII transmitter must only send 0-9, * and #. The attached email explains the rationale. This codepoint does not mean that transmitters must send these but can also send others because that would be redundant with 6.2.8/H.323v2: "H.323 terminals shall support the transmission of user input characters 0-9, '*', and '#'. Transmission of other characters is optional."
Paul
-----Original Message----- From: Paul E. Jones [mailto:paulej@PACKETIZER.COM] Sent: Tuesday, March 16, 2004 12:48 PM To: Dave Lindbergh Cc: itu-sg16@external.cisco.com; Mike Nilsson Subject: Re: H.245 User Input Indication question
Dave, Thanks for looking into this. Hopefully, Mike might have some recollection as to what this was intended for. It has been there for quite some time. Paul ----- Original Message ----- From: Dave Lindbergh To: Dave Lindbergh Cc: Paul E. Jones ; itu-sg16@external.cisco.com ; Mike Nilsson ; Paul Long Sent: Tuesday, March 16, 2004 1:32 PM Subject: Re: H.245 User Input Indication question
Paul,
I've just looked at H.245, and I can't figure it out either.
I suggest that once we figure it out (or decide to deprecate it, if we can't figure it out), we add some text to H.245 to clarify this.
Sorry.
--Dave
At 11:57 AM 3/16/2004, Dave Lindbergh wrote:
At 11:53 AM 3/16/2004, Paul E. Jones wrote:
Dave, So, I'm still confused. "are supported" means: a) The device may ONLY send that subset of characters? b) The device must support that subset, but may send others?
Neither (but closer to b). It means the device DOES support that subset. It might also support others, might not. There's no "must" or "shall" about it - it's a statement about what the device actually does.
Also, any insight into what the "userInputSupportedIndication" element is for within "UserInputIndication"?
I'll try to look into that later today.
--Dave
Thanks, Paul ----- Original Message ----- From: Dave Lindbergh To: Paul E. Jones Cc: itu-sg16@external.cisco.com ; Mike Nilsson ; Paul Long Sent: Tuesday, March 16, 2004 11:48 AM Subject: Re: H.245 User Input Indication question Hi Paul, My recollection is that "are supported" was meant to indicate that the device can send those characters. (I think UII can send anything in the ASCII, and perhaps the Unicode, set.) The purpose of the "are supported" bit is to allow an automatic menu generator to limit the kinds of input it requests to what the far-end terminal can actually send. (weak example: "Press # for Customer Service" vs "Type SERVICE for Customer Service")...in fact people have used UII to do things like text chat, which is difficult with only a phone keypad. --Dave At 11:40 AM 3/16/2004, Paul E. Jones wrote: Folks, I have a question regarding H.245 User Input Indication. In section B.14.6, it states: "The boolean basicString, when true, indicates that the characters 0-9, * and # are supported." My question is whether that those characters are supported means that it is the only valid characters that may be transmitted? Or is it also valid to transmit A,B,C,D, for example? In other words, does this wording simply indicate the minimum set of characters that must be supported or is the wording intended to specify the complete set of characters that may be used with "basicString". H.323 Section 6.2.8 simply says that "alphaNumeric" must be supported and that the characters 0-9, * and # must be supported and others are optional. However, it does not speak to whether endpoints must advertise support for basicString, IA5String, etc.
A second question: can somebody explain why there is a CHOICE of "userInputSupportIndication" inside the UserInputIndication message? Would we not always advertise capabilities via the UserInputCapability only? Is the intent of having the "userInputSupportIndication" for changing capabilities outside of a normal capability exchange. Any clarification you can provide would be most appreciated. Thanks, Paul ---------- Dave Lindbergh Polycom, Inc. 100 Minuteman Road Andover MA 01810 USA Voice: +1 978 292 5366 Email: lindbergh@92F1.com H.320, H.323 video by arrangement ---------- Dave Lindbergh Polycom, Inc. 100 Minuteman Road Andover MA 01810 USA Voice: +1 978 292 5366 Email: lindbergh@92F1.com H.320, H.323 video by arrangement ---------- Dave Lindbergh Polycom, Inc. 100 Minuteman Road Andover MA 01810 USA Voice: +1 978 292 5366 Email: lindbergh@92F1.com H.320, H.323 video by arrangement