Censor caller ID and full phone numbers

--- PjsuaCommunicator.cpp
+++ PjsuaCommunicator.cpp
@@ -5,6 +5,7 @@
 
 #include <boost/algorithm/string.hpp>
 #include <boost/format.hpp>
+#include <boost/regex.hpp>
 
 using namespace std;
 
@@ -131,6 +132,7 @@ namespace sip {
 
     void _Call::onCallState(pj::OnCallStateParam &prm) {
         auto ci = getInfo();
+        boost::regex re("(?:\"[^\"]+\" )?sip:([0-9]{4})[0-9]+@");
 
         communicator.logger.info("Call %d state=%s.", ci.id, ci.stateText.c_str());
 
@@ -138,6 +140,7 @@ namespace sip {
 
         boost::replace_all(address, "<", "");
         boost::replace_all(address, ">", "");
+        address = boost::regex_replace(address, re, "sip:$1XXXXXX@");
 
         if (ci.state == PJSIP_INV_STATE_CONFIRMED) {
             auto msgText = "Incoming call from " + address + ".";