[Feature][R306BR][task-view-1592][voice] add call back

Change-Id: Ie436883a23936b3e3aa591bf7af4bced22bbb81a
diff --git a/lynq/R306BR/ap/app/ccapp/cc_proc.c b/lynq/R306BR/ap/app/ccapp/cc_proc.c
index 26f4544..7d5a910 100755
--- a/lynq/R306BR/ap/app/ccapp/cc_proc.c
+++ b/lynq/R306BR/ap/app/ccapp/cc_proc.c
@@ -1543,6 +1543,10 @@
 

             zte_log_append(__FILE__, __LINE__, "zte_ccapp.log","%s  zCc_DsciIndProc: send ZCC_SEIZE_E to sub <---\n",__FUNCTION__);

         }

+        else

+        {

+            cfg_set("callback_number", "");

+        }

         

         break;

       case 2://Z_MMIACC_CALL_STATE_MO_DIALING