----- 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