In H.225.0 V1, section 7.3.6 describes the User Information message. The related ASN.1 definition is named UI-UUIE, but the table and caption (Table 9) describe the Q.931 Information message.

H.323 V2 describes the use of the Information message (for example, to support overlap sending), but H.225.0 V2 contains no section describing the Information message and no ASN.1 has been defined specifically for use with the Information message.

Possible fixes seem to be:

1 - rename section 7.3.6 from "User Information" to "Information" and add some text stating that the Information message is used to support overlap sending

2 - correct section 7.3.6 to align with the User Information message (correct the table, correct the reference to Q.931) and add a new section (and associated ASN.1) for the Information message

3 - other suggestions?

As backward compatibility is a concern, the best approach depends on existing implementations and the use of User Information or Information messages. So, a vendor that decides to implement might interpret this to be a User Information message with a different set of information elements (not as described in table 9/H225) or an Information message with the set of information elements as defined in table 9.

Please comment.

Regards, Glen Freundlich (editor H.225.0)

-- Glen Freundlich ggf@lucent.com Lucent Technologies office: +1 303 538 2899 11900 N. Pecos fax: +1 303 538 3907 Westminster, Colorado 80234 USA