The linphone/linphonec application sends out a User-Agent: header that
does not conform to common internet practices.

Example:
        CSeq: 1 REGISTER
        Contact: <sip:[EMAIL PROTECTED]:5060>
        Max-Forwards: 70
        User-Agent: Linphone-1.7.1/eXosip
 

Problems:
- the version number should be separated by the program name with a slash ('/')

- the agent and any subproducts which form a significant part of the
  agent should be listed in order of their significance for
  identifying the application

- the user-agent string should be user configurable


A more correct form of the header could be:
        User-Agent: Linphone/1.7.1 eXosip/0.1


References:
- news article format, section 6.16
  http://www.ietf.org/internet-drafts/draft-ietf-usefor-article-03.txt
- understanding User-Agent strings 
  http://msdn2.microsoft.com/en-us/library/ms537503.aspx
- email message headers & descriptions 
  http://stopspam.nettally.com/headers.asp


Thanks to all the developers for making such a great free communication tool.



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