Re: [Sip-implementors] SIP messages with XML

[M. Ranganathan]

The one advantage that I can see is the ability to represent a 
standardized serial format for sip messages so as to enable pattern 
matching on partially formatted sip messages. The sip protocol call flow 
can be represented by a causally ordered sequence of such partially 
specified messages and from that a correctness checker can be generated. 
I had got started along those lines but got diverted.

For example,

<SIPREQUEST
   method = INVITE
  >
  <REQUEST_URI
         userName = *
    >
    <ADDRESS
         hostName = "*.nist.gov"
     />
  </REQUEST_URI>
</SIPREQUEST>
Would match any sip request that had a method of INVITE originating from 
nist.gov domain.

This can be used to encode call flows. Here is a paper along those lines 
- http://www-x.antd.nist.gov/proj/iptel/papers/whitepaper.pdf

Hope this helps.

Regards

Ranga.

Ivan Smolcic wrote:

Has there been any work done with encoding SIP messages with XML? If 
there has, please tell me where I can find out more about it.
What are the advantages of encoding SIP messages with XML instead of 
plain text?

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M. Ranganathan 

Advanced Networking Technologies Divsion,
National Institute of Standards and Technology (NIST),
100 Bureau Drive, Stop 8920, Gaithersburg, MD 20899. 
tel:301 975 3664 , fax:301 590 0932 http://w3.antd.nist.gov/
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