Here is the capture from server,

##
T 2013/09/05 12:06:22.298929 192.168.41.60:53983 -> 192.168.41.10:5060 [AP]
GET /xcap-root/pidf-manipulation/users/sip:test@kamailio.com/perm-presence HTTP/1.1^@
Host: kamailio.com^@
Keep-Alive: 115^@
Connection: keep-alive^@
TE: trailers^@
^@
#
T 2013/09/05 12:06:22.357104 192.168.41.10:5060 -> 192.168.41.60:53983 [AP]
HTTP/1.1 200 OK^@
Via: SIP/2.0/TCP 192.168.41.60:53983^@
ETag: "sr-1377875323-9520-14"^@
Content-Type: application/pidf+xml^@
Server: kamailio (4.0.2 (i386/linux))^@
Content-Length: 683^@
^@
<?xml version = "1.0" encoding = "UTF-8"?><presence xmlns="urn:ietf:params:xml:ns:pidf" xmlns:pdm="urn:ietf:params:xml:ns:pidf:data-model" xmlns:rpid="urn:ietf:params:xml:ns:pidf:rpid" xmlns:op="urn:oma:xml:prs:pidf:oma-pres" xmlns:opd="urn:oma:xml:pde:pidf:ext" xmlns:opd11="urn:oma:xml:pde:pidf:ext:1.1" xmlns:gp="urn:ietf:params:xml:ns:pidf:geopriv10" xmlns:cl="urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr" xmlns:caps="urn:ietf:params:xml:ns:pidf:caps" xmlns:gml="http://www.opengis.net/gml" xmlns:gs="http://www.opengis.net/pidflo/1.0" xmlns:lt="urn:ietf:params:xml:ns:location-type" entity = "sip:test@kamailio.com"><pdm:person id = "aa"></pdm:person></presence>
##


^@^@^@^@^@^@
#
T 2013/09/05 12:06:22.389308 192.168.41.60:53985 -> 192.168.41.10:5060 [AP]
Host: kamailio.com^@
Keep-Alive: 115^@
Connection: TE, Keep-Alive^@
TE: trailers^@
Content-Length: 117^@
Content-Type: application/xcap-el+xml^@
^@

##
T 2013/09/05 12:06:22.389576 192.168.41.60:53985 -> 192.168.41.10:5060 [AP]
<pdm:person id = "aa"><op:overriding-willingness><op:basic>closed</op:basic></op:overriding-willingness></pdm:person>
##
T 2013/09/05 12:06:22.403805 192.168.41.10:5060 -> 192.168.41.60:53985 [AP]
HTTP/1.1 500 Server error^@
Via: SIP/2.0/TCP 192.168.41.60:53985^@
Server: kamailio (4.0.2 (i386/linux))^@
Content-Length: 0^@
^@