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List:       sip-implementors
Subject:    RE: [Sip-implementors] Re: [SIPPING] automatic answer
From:       "Brian Rosen" <br () brianrosen ! net>
Date:       2004-10-19 20:04:10
Message-ID: 200410192004.i9JK4Sx6011911 () cs ! columbia ! edu
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You can't.

I've seen some systems implement a hint in Alert-Info, but it is not
standardized.  There is some text in 3PCC about using local URI conventions.

Generally, you can't use a protocol like SIP to force the other end to do
something, because it's a security risk.  Alert-Info has a note about that.

Brian

> -----Original Message-----
> From: sip-implementors-bounces@cs.columbia.edu [mailto:sip-implementors-
> bounces@cs.columbia.edu] On Behalf Of ???
> Sent: Tuesday, October 19, 2004 7:31 AM
> To: Brian Rosen; sip-implementors@cs.columbia.edu
> Subject: [Sip-implementors] Re: [SIPPING] automatic answer
> 
> Thanks Brian,
> 
> What I am telling is to force the phone to answer (to send 200 OK without
> user intervention) by which params in INVITE.
> 
> That functionality is required to send/receive some information on the
> phone to/from the server.
> 
> 
> BR
> 
> Jinkyung Hwang
> KT
> 
> ----- Original Message -----
> From: "Brian Rosen" <br@brianrosen.net>
> To: "'ȲÁø°æ'" <jkhwang@kt.co.kr>; <sip-implementors@cs.columbia.edu>
> Sent: Tuesday, October 19, 2004 8:12 PM
> Subject: RE: [SIPPING] automatic answer
> 
> 
> Redirected to sip-implementors
> 
> As with any automatic answering system, you don¡¯t need any standards.
You
> just answer (send 200 OK).
> 
> You can¡¯t force (or signal) the called party to answer; it makes its own
> decision.
> 
> The UAC sends INVITE
> The UAS could send a 180 if it wants; sometimes it¡¯s disconcerting to get
> the answer too quickly
> The UAS sends 200 OK
> 
> That¡¯s it.
> 
> Brian
> 
> ________________________________________
> From: sipping-bounces@ietf.org [mailto:sipping-bounces@ietf.org] On Behalf
> Of ???
> Sent: Tuesday, October 19, 2004 1:17 AM
> To: sipping@ietf.org
> Subject: Re: [SIPPING] automatic answer
> 
> Dear Folks,
> 
> 
> I have not found out the related I-D or RFC regarding "automatic answer
> feature" for SIP phone.
> 
> To implement in the SIP phone, is it reasonable to use Call-Info field ?
> 
> 
> Any reponse would be appreciated.
> 
> 
> Jinkyung Hwang
> KT
> 
> ----- Original Message -----
> From: ȲÁø°æ
> To: sipping@ietf.org
> Sent: Saturday, October 09, 2004 12:01 PM
> Subject: automatic answer
> 
> Hi,
> 
> Is there any I-D regarding params for SIP phone to answer automatically ?
> (for answering machine functionality)
> 
> I would like to know when the call arrives a phone, by which param/header
> value the phone answers without ringing.
> 
> 
> 
> Any reponse would be appreciated.
> 
> 
> Jinkyung Hwang
> KT
> 
> 
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementors@cs.columbia.edu
> http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
> 





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