How can I pass a href link through Rest API ?

How can I pass a href link through Rest API ?

Hello

I'm get problem with passing a href link through Rest API.
I want to create link to callback function and get problem with passing link.
My API request (send throuth PHP curl script):
TECHNICIAN_KEY=5..F&OPERATION_NAME=ADD_REQUEST&INPUT_DATA=<?xml version=\"1.0\" enco
<Operation>
<Details>
<requester>test_user</requester>
<subject>Request Subject</subject>
<description>
 <a href=\"http://server1?callbackFunc\" target=\"_blank\">callback link</a>
</description>
<level>Tier 1</level>
<REQUESTTYPE>Incident</REQUESTTYPE>
<MODE>Phone</MODE>
<IMPACT>Low</IMPACT>
<URGENCY>Low</URGENCY>
<status>Open</status>
</Details>
</Operation>

How I can do this? 

How can I get phone_number of Technician which use this link? 

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