Re: [Sipping] New draft on end system communication services

[Arjun Roychowdhury <[e-mail]>]

Xiaotao/Henning,

Thanks for the *excellent* draft. It effectively addresses a lot of
CPL limitations. Even though your draft has the noble intent of
end-devices, I can see B2BUA providers rubbing their hands in glee ;-)

One quick comment: Is it at all possible to provide an interface using
which a person creating a service  in LESS can do a database-dip to
resolve a URI ?
Hardcoding URIs into scripts is often very limiting. To make it more
general, it would be very useful if there was a way in which 
applications could 'intercept' the call flow of LESS for the only
purpose of providing 'input' to the next stage.

More comments later as I digest the rest.

regds
arjun



On Thu, 17 Feb 2005 19:33:16 -0500 (EST), Xiaotao Wu
<[e-mail]> wrote:
> We have written a new draft on the Language for End System Services (LESS)
> 
> http://www.ietf.org/internet-drafts/draft-wu-iptel-less-00.txt
> 
> This work can be closely related to the SIP P2P work because in a P2P
> network, there is no infra-structure to provide communication services,
> for example, phone spam filtering. Usually, users will not put their
> services on peers' node due to privacy and security reasons. That makes
> end system services very important, and it is necessary to define a
> mechanism for end system service creation.
> 
> >From the abstract:
> 
>    In Internet telephony, end systems can take a large role in providing
>    services, especially in networks without pre-configured
>    infra-structure, such as peer-to-peer networks.  Since we believe
>    that end system services differ in their requirements from network
>    services, we define a new service creation scripting language called
>    the Language for End System Services (LESS).  LESS inherits many
>    characteristics from the Call Processing Language (CPL).  It contains
>    commands and events for direct user interaction and the control of
>    media applications.  This document defines the basic elements of LESS
>    and several commonly used LESS extensions.
> 
> Suggestions and comments would be appreciated.
> 
> -Xiaotao
> 
> ===========================================================
> Name      : Xiaotao Wu
> Email     : [e-mail]
> Homepage  : http://www.cs.columbia.edu/~xiaotaow
> Phone     : [phone],  Fax: [phone]
> Phone-PC  : [phone]
> SIP       : sip:[e-mail]
> Office    : Room 506, Computer Science building, West 120th
> ===========================================================
> 
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-- 
Arjun Roychowdhury

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