RE: [Sipping] Text support in SIP phones

["Drage, Keith (Keith)" <[e-mail]>]

I would suggest that treating these sort of things as MUST strength is best left to national regulatory requirements, along with other things like fitness for purpose and so on. I have no objection to their being mentioned. By the way, I understood this document was being progressed as authors individual submission, and was therefore not standards track.

Any such MUST would surely need to be qualified anyway. If the purpose of the devise is such that it renders a textual devise irrelevant, then why require one to be fitted. Suppose we were designing a SIP phone for the totally blind, and this was designed to be worn as a headset, a text device would be irrelevant to such a user, and positioning such a device where it could be seen would require an extra box hanging out of the side of the product.

regards

Keith

Keith Drage
Lucent Technologies
Tel: [phone]
Email: [e-mail] 

> -----Original Message-----
> From: Henry Sinnreich [mailto:[e-mail]]
> Sent: 27 May 2003 17:18
> To: 'Gunnar Hellström'; 'Sipping@Ietf. Org'; 
> 'Sipforum-Discussion@Lists.
> Su. Se'
> Cc: 'Henry Sinnreich'
> Subject: RE: [Sipping] Text support in SIP phones
> 
> 
> Gunnar, this all seems very reasonable, and I will try to insert it
> properly.
> 
> Henry
> 
> > -----Original Message-----
> > From: [e-mail] [mailto:[e-mail]] 
> > On Behalf Of Gunnar Hellström
> > Sent: Thursday, May 22, 2003 6:54 PM
> > To: 'Sipping@Ietf. Org'; Sipforum-Discussion@Lists. Su. Se
> > Cc: Henry Sinnreich
> > Subject: [Sipping] Text support in SIP phones
> > 
> > 
> > Sorry, I missed out the reference to the SIP device specification.
> > 
> > Henry and all,
> > 
> > Some time ago, I suggested addition of support for real time 
> > text communication to the SIP device specification 
> > 
> http://www.ietf.org/internet-drafts/draft-sinnreich-sipdev-req-00.txt
> > 
> > This was the simple part of the proposal:
> > 
> > > SIP-zz, digital text support: SIP telephone devices MUST support
> > >   real time text conversation using RFC 2793 [y] for the 
> > text stream.
> > >   It MUST be possible to use text simultaneously with voice.
> > >
> > >
> > >
> > > ---------------------------------------------
> > > In 4.11 Ringer Behaviour  : add the section below for the 
> > purpose of 
> > > deaf, hearing impaired, deaf-blind people and people in the 
> > garden and 
> > > noisy
> > > locations:
> > >
> > > SIP Telephony devices MUST provide an external interface to an 
> > > external alerting system.
> > >
> > >
> > >
> > > Add to References
> > > -----------------
> > > [y] G. Hellstrom: "RTP Payload for Text Conversation.", RFC 2793, 
> > > IETF, May 2000.
> > >
> > > --------------------------------------------------------------
> > 
> > The reception of this proposal was very positive.
> > Now, I would like to see the final formulation, and check 
> > that we agree on it.
> > 
> > I regard this requirement to be very light. In the Interface 
> > section ( e.g.
> > Int-2) , there is already mentioning of mandatory text input 
> > mechanisms, and assumptions that a display would be normal, 
> > since handling of phone books and buddy lists are mandatory. 
> > To re-use these text interface devices during the call for 
> > standardised text conversation purposes seems straightforward.
> > 
> > It could be wise to add the T.140 text presentation protocol 
> > as a codec to the codec section. The normal SDP used together 
> > with RFC2793 for text could also be specified. Do you want 
> to do that?
> > 
> > 
> > -----
> > 
> > We also need to check the ideas around the other proposed 
> > requirements: The requirement to include text telephone modem 
> > in all designs where an RJ11 phone connector exists, and the 
> > requirement to support RFC 3351. I suggest that we start with 
> > the straightforward and mainstream requirement above. Is that 
> > accepted as it is?
> > 
> > 
> > Regards
> > 
> > Gunnar
> > -------------------------------------------
> > Gunnar Hellström, Omnitor, Renathvägen 2
> > SE 121 37 Johanneshov, SWEDEN
> > Tel: [phone]  Mob: [phone]
> > e-mail: [e-mail]
> > web: www.omnitor.se
> > 
> > 
> > 
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