Merged revisions 61477 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r61477 | russell | 2007-04-11 11:05:29 -0500 (Wed, 11 Apr 2007) | 13 lines

Merged revisions 61476 via svnmerge from 
https://origsvn.digium.com/svn/asterisk/branches/1.2

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r61476 | russell | 2007-04-11 11:01:25 -0500 (Wed, 11 Apr 2007) | 5 lines

If someone sets the "useragent" option in sip.conf to be empty, then don't add
the User-Agent header at all.  It is an optional header, anyway.  Also, the bug
report says that some of Japan's SIP providers don't allow it for some weird
reason.  (issue #9488, reported by makoto, fixed by me)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@61478 65c4cc65-6c06-0410-ace0-fbb531ad65f3