--- /dev/null
+Adding Captured Hold Phone Notification Number to Checkin Repsonse
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Some third party systems can phone users when a SIP checkin captures
+an item they have on hold. Normally, to do this a patron information
+request is sent (message pair 63/64), but some systems will only look
+for it in the reply to the Checkin pair, 09/10. Because this is not
+a part of the SIP2 standard and exposes patron personal information
+when used indescriminately, it must be enabled by including the key
+<phone_ext_on_msg10 enabled="true" /> in the "institution"
+section of oils_sip.xml.
+