X ranges from 1 to 21 (for SIP-T27P). 
X ranges from 1 to 3 (for SIP-T23P/G) 
X ranges from 1 to 2 (for SIP-T21(P) E2). 
Example: 
linekey.1.value = http://10.3.5.97:8080/URLRecord/record.xml 
Web User Interface: 
DSSKey->Line Key->Value 
Phone User Interface: 
Menu->Features->DSS Keys->Line Key X->Value 
To configure a record key via web user interface: 
1.  Click on DSSKey->Line Key. 
2.  In the desired DSS key field, select Record from the pull-down list of Type. 
3.  (Optional.) Enter the string that will appear on the LCD screen in the Label field. 
 
4.  Click Confirm to accept the change. 
To configure a URL record key via web user interface: 
1.  Click on DSSKey->Line Key. 
2.  In the desired DSS key field, select URL Record from the pull-down list of Type. 
3.  Enter the URL in the Value field.