Pete and all,

two comments on this mail:

It has been mentioned that when a gatekeeper performs a re-route it would be good for the client to know about it. After much investigation, there seems to be no message in Q.931 that handles this case. In the text that I proposed in Sunriver I suggested that a Facility message with a H.450 ctComplete should be sent. However, this is not much use to an entity that does not support supplementary services. Therefore it might be useful to add can extra case to the H323-UU-PDU to cover this, e.g.:

H323-UU-PDU ::= SEQUENCE { h323-message-body CHOICE { setup Setup-UUIE, callProceeding CallProceeding-UUIE, connect Connect-UUIE, alerting Alerting-UUIE, userInformation UI-UUIE, releaseComplete ReleaseComplete-UUIE, facility Facility-UUIE, ..., progress Progress-UUIE, dummy NULL,

First:

I must have missed the "dummy" parameter before. I assume the need for an empty parameter comes from supplementary services, and I suggest to call it "empty NULL" (this is not an implementation but a standard after all) and to describe it somewhere in H.225.0. Searching through the document, the ASN.1 was the only place where "dummy" was used. (Should I be saying something about puzzles right now? :-)

            reRouteIndication       ReRouteIndication
    },
    nonStandardData NonStandardParameter OPTIONAL,
    ...,

h4501SupplementaryService SEQUENCE OF H4501SupplementaryService

OPTIONAL

}

ReRouteIndication ::= SEQUENCE { display IA5String (SIZE( 0..255) ), endpointInfo EndpointType, ... }

This could then be sent by a gatekeeper when a re-route has been done.

Second:

Overall, I agree with the mail from Ernst Horvath on this issue: we should not add such functionality to H.225.0, not even to version two.

Joerg