Hello,
the XLOG-Module prints an error if the User-Agend %ua Parameter is called on a request that does not contain a User-Agent header:
XLOG: xl_get_useragent: ERROR cannot parse User-Agent header
This is probably a bug, because this error is not showing up on a non-existant Contact-Header, nor on a non-existant To-Tag. Version is rel_0_9_0 cvs.
With best regards, Martin Koenig