Hi, Paul:

I understand your points, and we also believe that we should work for version 3, but it would be nice if we could finish for version 2 first. Presently, my company (AT&T), like many other companies, has also difficulties to get version 3 implemented because of problems as stated earlier.

However, we all realize that version 3 is needed and will be working for version 3 immediately as soon as we finish our work for version 2.

I also like to point out that we are working for the informational RFCs and hope that we can produce the interworking spec for version 3 very quickly once we finish the same for version 2. My guess is that version 3 needs some incremental changes from those of version 2. So, I think that the work for version 3 can be completed quickly.

Hope that this will answer your questions.

Best regards, Radhika R. Roy AT&T

-----Original Message----- From: Paul E. Jones [mailto:paulej@packetizer.com] Sent: Monday, August 28, 2000 11:53 PM To: Roy, Radhika R, ALCOO; sip-h323@egroups.com; ITU-SG16@mailbag.cps.intel.com Subject: Re: [sip-h323] SIP-H.323 interworking Requirements Draft

Radhika,

A few months ago, I published the final set of ASN.1 corrections for H.323v3 to the ITU-T SG16 mailing list and to the IMTC H.323 mailing list. I also contact 11 companies that have H.323v3 products or products in development that I was aware of.

There are certainly plenty of v3 implementations in progress and it's important to be prepared for those implementations. H.323v4 will be approved in November and I expect even quicker adoption of that Recommendation, because it introduces a lot of new functionality.

I think what the group should try to strive for is a specification that will work with the most recent version of H.323-- H.323v4. Of course there will be few implementations, but there are not a large number of new mandatory features. (I don't have a list handy.)

For a "bigger picture" view of what's new in the various versions of H.323, see: http://www.packetizer.com/iptel/h323/

Best Regards, Paul

----- Original Message ----- From: "Roy, Radhika R, ALCOO" rrroy@att.com To: "Roy, Radhika R, ALCOO" rrroy@att.com; sip-h323@egroups.com Sent: Monday, August 28, 2000 10:32 PM Subject: RE: [sip-h323] SIP-H.323 interworking Requirements Draft

Hi, Everyone:

Here is my view as stated below:

It is very difficult to find any vendor to support H.323 version 3. Many companies are now testing vendor implementations of H.323 version 2, and

it

is also reported that multivendor interoperability at the version 2 level

is

still problematic. In many cases, no promise has been obtained from the major vendors when they will support version 3. It may be very nice to

have

SIP/H.323 v3 interworking, but we think SIP/H.323 v2 interworking should come first.

Considering all factors, I think that we should keep our first

interworking

requirements to support H.323 version 2 as defined in the present draft (while we may consider for H.323 version 3 in the future).

So, I recommend that we should make any changes in the present draft.

Best regards, Radhika R. Roy AT&T +11 732 420 1580

-----Original Message----- From: Roy, Radhika R, ALCOO [mailto:rrroy@att.com] Sent: Sunday, August 27, 2000 10:32 PM To: sip-h323@egroups.com Subject: [sip-h323] SIP-H.323 interworking Requirements Draft

Hi, Everyone:

I have just returned from the ITU-T SG16 Q.13 (H.323) meeting where our SIP-H.323 Interworking requirement draft was also discussed.

The Q.13 members have strongly recommended that we should consider H.323 version 3 (instead of version 2) for our SIP-H.323 interworking work.

We would appreciate if you would kindly provide your comments on the

point.

Best regards, Radhika R. Roy AT&T +1 732 420 1580 rrroy@att.com

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