The HTTP request to AXL would use the <updateAppUser> request:
 
POST https://10.88.131.141:8443/axl/ HTTP/1.1
Accept-Encoding: gzip,deflate
Content-Type: text/xml;charset=UTF-8
SOAPAction: "CUCMB ver=8.0 updateAppUser"
User-Agent: Jakarta Commons-HttpClient/3.1
Content-Length: 449
Authorization: Basic QWRtaW5pc3RyYXRvcjpjaXNjbyExMjM=
Host: 10.88.131.141:8443
 
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns="http://www.cisco.com/AXL/API/8.0">
   <soapenv:Header/>
   <soapenv:Body>
      <ns:updateAppUser sequence="1">
         <userid>testAppUser</userid>
         <associatedDevices>
            <!--Zero or more repetitions:-->
            <device>SEP123456789012</device>
         </associatedDevices>
      </ns:updateAppUser>
   </soapenv:Body>
</soapenv:Envelope>
 
Note that the <associatedDevices> list must be complete - i.e. the entire list of devices for the user will be replaced by this list.

Hy Deepak,

all the phones which should be associated with the appuser had to be within this update request.
All phone not in the request will be deassociated by the callmanger. You could trace this behaviour
on the RTMT in the Axl Log. If you put it to debug Level you can see what is done ob the cucm on
sql level if u to some request.

cheers Floh