Referred documentation where arrays are mandatory:
http://support.sippysoft.com/solution/articles/107508-packet-sniffer-scheduler
<member><name>target_hosts</name> <value><array><data> <value><string>1.2.3.4</string></value> <value><string>2.2.2.2</string></value> </data></array></value></member>
Full request:
<?xml version="1.0"?> <methodCall><methodName>dumpIPTraffic</methodName> <params> <param> <value><struct> <member><name>i_customer</name><value><int>1</int></value></member> <member><name>email</name><value><string>[email protected]</string></value></member> <member><name>period</name><value><int>1</int></value></member> <member><name>interface</name><value><string>igb1</string></value></member> <member><name>target_hosts</name> <value><array><data> <value><string>1.2.3.4</string></value> <value><string>2.2.2.2</string></value> </data></array></value> </member> </struct></value> </param> </params> </methodCall>