Hello,
Official Moodle core does not have a SOAP server waiting for your connexions. However you can peek into this discussion OKTech Web Services http://moodle.org/mod/forum/discuss.php?d=67947 about a Web Service using SOAP.
More details on http://cipcnet.insa-lyon.fr/Members/ppollet/public/moodlews/ to get current server code, client examples (php, java, python, C#...) and some docs.
Cheers.
Web services
Incoming SOAP Connection
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