[Sipping] Re: I-D ACTION:draft-akhtar-sipping-header-reduction-00.txt

[Jonathan Rosenberg <[e-mail]>]

Its not clear from reading this document why everything in here cannot 
be accomplished with sigcomp alone. The basic idea, if I understand 
right, is that, upon registration, the proxy server stores certain 
information about the UA which is not expected to change from request to 
request, and it repopulates it when a UA emits a request (which won't 
contain that information). That is more or less equivalent to placing 
that information into a sigcomp dictionary and then using sigcomp to ask 
the server to extract the information from the dictionary.

Thanks,
Jonathan R.

[e-mail] wrote:

> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> 
> 
> 	Title		: New SIP Headers for Reducing SIP Message Size 
> 	Author(s)	: H. Akhtar, et al.
> 	Filename	: draft-akhtar-sipping-header-reduction-00.txt
> 	Pages		: 18
> 	Date		: 2006-2-28
> 	
>    Current SIP messages are text based and inherently large, especially
>    when these messages are to be transmitted over the bandwidth-strained
>    wireless access technologies (a typical orginiating SIP Invite is 
>    about 1200 bytes). 
> 
>    For most wireless technologies, transmitting the session initiation 
>    messages (such as SIP Invite) over the signaling channel can reduce 
>    the call setup time substantially. The size limitation of these 
>    wireless signaling channels are typically very small (~210 bytes in 
>    the uplink and ~110 bytes in the downlink).
> 
>    To address this problem, a new function called Encoding Assitant    
>    (EA) has been introduced in the User Agent (UA) and in the 
>    SIP Proxy server within the network. Additionally, the method 
>    provided in this document defines new SIP option tags and headers. 
>    These new option tags and headers allow the UA and a SIP Proxy 
>    server within the network (such as the P-CSCF), to exchange 
>    information using the signaling channels supported by most wireless 
>    access networks.
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-akhtar-sipping-header-reduction-00.txt
> 
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-- 
Jonathan D. Rosenberg, Ph.D.                   600 Lanidex Plaza
Cisco Fellow                                   Parsippany, NJ 07054-2711
Cisco Systems
[e-mail]                              FAX:   [phone]
http://www.jdrosen.net                         PHONE: [phone]
http://www.cisco.com

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