H.323 Annex I

Roy, Radhika R, ALARC rrroy at ATT.COM
Wed Nov 24 10:04:11 EST 1999

Hi, Chris:

I guess that you have missed all discussions and contributions related H.323
mobility (SG16 meeting in May'99, Berlin Aug'99, and Red Bank NJ Oct'99).

H.323 is in application layer.

IP/IPX is in the network layer.

Radio/ATM is in the link layer.

Mobility may have an impact in all layers. If the link layer mobility is
transparent to the network layer, nothing should be done in the network
layer. Similar is the case for others.

When the mobility has an impact in the H.323 layer resources, we need to
take into account in the H.323 layer.

How does the H.323 mobility work?

Please see AT&T contributions - APC-1651 provided in the Red Bank meeting.
The 70-page contribution has proposed a complete solution for H.323
mobility. There are contributions as well.

Hope this will clarify your questions.

Best regards,

> -----Original Message-----
> From: Chris Wayman Purvis [SMTP:cwp at ISDN-COMMS.CO.UK]
> Sent: Wednesday, November 24, 1999 4:31 AM
> Subject:      Re: H.323 Annex I
> All,
> Might I be permitted to attempt to summarise Mr Roy's mail while asking my
> own
> question (my apologies to Mr Roy if I've misunderstood his point!)?
> I'm not an expert on Mobile IP.  However, I don't understand why there is
> anything at all involved in H.323 mobility beyond making the statement "In
> IP
> networks, mobility issues are handled by using Mobile IP", and expecting
> users
> of other transports (IPX, native ATM etc) to make their own arrangements.
> So, the question: Why is the effort on mobility required?
> Obviously if this question is answered in contributions that I've missed,
> I'll
> be happy with a reference rather than a full explanation on the list!
> Regards,
> Chris
> --
> Dr Chris Purvis -- Development Manager
> ISDN Communications Ltd, The Stable Block, Ronans, Chavey Down Road
> Winkfield Row, Berkshire.  RG42 6LY  ENGLAND
> Phone: +44 1344 899 007
> Fax:   +44 1344 899 001

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