FW: [sip-h323]

Thu Sep 6 15:16:15 EDT 2001

I expect this should really go to the H.323 Implementors list, but maybe
some people out there want to answer James.

-----Original Message-----
From: Yu, James [mailto:james.yu at neustar.com]
Sent: Thursday, September 06, 2001 2:29 PM
To: 'sip-h323 at yahoogroups.com'
Subject: RE: [sip-h323]

Charles,

Cisco has a proposal to support number portability for H.323.   My question
on H.323 is "who, the GK or GW, will do the NP queries?   I guess that
either one can do it but just want to know in the real world who will be
doing that.

James
-----Original Message-----
From: Agboh, Charles [mailto:charles.agboh at ebone.com]
Sent: Tuesday, July 31, 2001 6:17 PM
To: 'sip-h323 at yahoogroups.com'
Subject: RE: [sip-h323]

Hi Ranjit,

I believe TRIP will close that gap (contact details and thier
expiration/keepalive).

Regards,
Charles
-----Original Message-----
From: Ranjit Kumar Avasarala [mailto:ranjitka at email.masconit.com]
Sent: Wednesday, August 01, 2001 12:02 AM
To: sip-h323 at yahoogroups.com
Subject: RE: [sip-h323]

Hi Charles,
But RFC 2543 does not mandate processing of Expires header.
What is says is time duration mentioned in Expire header field can be used
as upper limit
For the user to respond.
So since it is optional it depends on the SIP Proxy / Registrar
implementation. I was thinking of the case
Where it is not implemented.
Regards
Ranjit
Mascon Communication Technologies
http://www.masconit.com
Ph: 847-240-2444
 -----Original Message-----
From:   Agboh, Charles [mailto:charles.agboh at ebone.com]
Sent:   Tuesday, July 31, 2001 4:42 PM
To:     'sip-h323 at yahoogroups.com'
Subject:        RE: [sip-h323]
Hi, Ranjit;
You may have looked at this but, the Expires header and optional "expires"
Contact parameter is just for that (Expires t; where t is time in seconds
(i.e. 0)).  See Section 4.2.6 of
http://www.cs.columbia.edu/sip/drafts/draft-ietf-sip-rfc2543bis-02.pdf  for
details.  Also see section 7.4 of
http://www.cs.columbia.edu/sip/drafts/draft-ietf-sip-rfc2543bis-03.pdf.
I hope this helps.
Regards,
Charles
> -----Original Message-----
> From: Roy, Radhika R, ALCTA [mailto:rrroy at att.com]
> Sent: Tuesday, July 31, 2001 11:19 PM
> To: sip-h323 at yahoogroups.com
> Subject: RE: [sip-h323]
>
>
> Hi, Ranjit:
>
> Yes, it is an issue (especially for the IWF where it will be
> working on
> behalf of many users).
>
> Our work is to limit ourselves within the context of RFC 2543.
>
> However, if there are any good proposals, we can make
> suggestion to the SIP
> WG for the future improvement.
>
> Alternatively, we can also work for some best current practices or
> experimental documents separately based on our collectives experiences
> (e.g., your suggestions for solving some of the problems for the IWF).
>
> Let us collect all the issues and, please provide more
> comments like this.
>
> Best regards,
> Radhika
>
> -----Original Message-----
> From: Ranjit Kumar Avasarala [mailto:ranjitka at email.masconit.com]
> Sent: Tuesday, July 31, 2001 5:15 PM
> To: sip-h323 at yahoogroups.com
> Subject: RE: [sip-h323]
>
>
>
> Hi Radhika,
>
> Ya I am talking of SIP side.
>
> In SIP there is no mechanism for the registrar to indicate to
> user agents
> that their registration has expired.
> So it should be either responsibility of UA to periodically
> monitor its
> registration status or registrar should
> Notify the UA about its registration status.
>
> I feel this could be a problem if IWF behaving like SIP UA
> and registers
> with SIP registrar using
> REGISTER method
>
> Thanks
>
> Ranjit
> -----Original Message-----
> From:   Roy, Radhika R, ALCTA [ mailto:rrroy at att.com
> <mailto:rrroy at att.com>
> ]
> Sent:   Tuesday, July 31, 2001 3:48 PM
> To:     sip-h323 at yahoogroups.com
> Subject:        RE: [sip-h323]
>
> Hi, Ranjit:
>
> IWF will have its two sides: SIP (UA) and H.323.
>
> Now for the SIP side, it will behave like a SIP UA and, its
> relationship
> with the SIP REGISTER will be in accordance to RFC 2543. So,
> some of the
> behaviors that you are describing may be applicable in this context.
>
> Best regards,
> Radhika
>
> -----Original Message-----
> From: Ranjit Kumar Avasarala [ mailto:ranjitka at email.masconit.com
> <mailto:ranjitka at email.masconit.com> ]
> Sent: Tuesday, July 31, 2001 4:43 PM
> To: sip-h323 at yahoogroups.com
> Subject: [sip-h323]
>
>
>
> Hi
>
>     Say IWF is registered with Sip registrar in SIP network
> and with GK in
> the H323 zone.
>
>
>
> Say the registration has expired after some time. Now
> registrar has no means
>
> of notifying IWF that its registration has expired.
>
> So I feel IWF should periodically monitor if its registration
> is active or
> the Registrar should send CANCEL message SIP
>
> Messages from IWF. Then IWF will come to know that its
> registration has
> expired and will re register.
>
>
>
> Regards
>
> Ranjit
>
>
>
>
>
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