diff --git a/contrib/scripts/asterisk.ldap-schema b/contrib/scripts/asterisk.ldap-schema
index c5a1f903157ecf74de2c3d0187d0c0c7651e0601..9eff674e520d780b3bb2bf5d4796a97b7a173421 100644
--- a/contrib/scripts/asterisk.ldap-schema
+++ b/contrib/scripts/asterisk.ldap-schema
@@ -1,9 +1,10 @@
 #
 # Copyright (c) 2007-2009 Suretec Systems Ltd. - <http://www.suretecsystems.com/>
 #
-# Version: 3.1.8
+# Version: 3.1.9
 #
 # Changes:
+# - https://issues.asterisk.org/view.php?id=13725 - 12/08/2009
 # - Added AsteriskVoiceMail Object class and AstAccountCallLimit attribute - 28/05/2009
 #   https://issues.asterisk.org/view.php?id=15155
 # - Added AstAccountLastQualifyMilliseconds - 28/05/2009
@@ -92,6 +93,9 @@ objectIdentifier AstVoicemailPager AstAttrType:55
 objectIdentifier AstVoicemailOptions AstAttrType:56
 objectIdentifier AstVoicemailTimestamp AstAttrType:57
 objectIdentifier AstVoicemailContext AstAttrType:58
+objectIdentifier AstAccountSubscribeContext AstAttrType:59
+objectIdentifier AstAccountIpAddr AstAttrType:60
+objectIdentifier AstAccountUserAgent AstAttrType:61
 
 
 #############################################################################
@@ -547,6 +551,27 @@ attributetype ( AstVoicemailContext
         SUBSTR caseIgnoreSubstringsMatch
         SYNTAX 1.3.6.1.4.1.1466.115.121.1.15)
 
+attributetype ( AstAccountSubscribeContext
+        NAME 'AstAccountSubscribeContext'
+        DESC 'Asterisk subscribe context'
+        EQUALITY caseIgnoreMatch
+        SUBSTR caseIgnoreSubstringsMatch
+        SYNTAX 1.3.6.1.4.1.1466.115.121.1.15)
+
+attributetype ( AstAccountIpAddr
+        NAME 'AstAccountIpAddr'
+        DESC 'Asterisk aaccount IP address'
+        EQUALITY caseIgnoreMatch
+        SUBSTR caseIgnoreSubstringsMatch
+        SYNTAX 1.3.6.1.4.1.1466.115.121.1.15)
+
+attributetype ( AstAccountUserAgent
+        NAME 'AstAccountUserAgent'
+        DESC 'Asterisk account user context'
+        EQUALITY caseIgnoreMatch
+        SUBSTR caseIgnoreSubstringsMatch
+        SYNTAX 1.3.6.1.4.1.1466.115.121.1.15)
+
 #############################################################################
 # Object Class definitions
 #
@@ -610,7 +635,10 @@ objectclass ( AsteriskIAXUser
         AstAccountNoTransfer $ 
         AstAccountName $
         AstAccountLastQualifyMilliseconds $
-        AstAccountCallLimit
+        AstAccountCallLimit $
+		AstAccountSubscribeContext $
+		AstAccountIpAddr $
+		AstAccountUserAgent		
     )
     )
        
@@ -656,7 +684,10 @@ objectclass ( AsteriskSIPUser
         AstAccountSecret $ 
         AstAccountName $
         AstAccountLastQualifyMilliseconds $
-        AstAccountCallLimit
+        AstAccountCallLimit $
+		AstAccountSubscribeContext $
+		AstAccountIpAddr $
+		AstAccountUserAgent	
     )
     )
 
diff --git a/contrib/scripts/asterisk.ldif b/contrib/scripts/asterisk.ldif
index 73e76a49bb5bc49b63ad115cdb9ac9b039c52ad4..cd2bc62ea30c0abdba5e3591a101f72e53dfcaa5 100644
--- a/contrib/scripts/asterisk.ldif
+++ b/contrib/scripts/asterisk.ldif
@@ -1,9 +1,10 @@
 #
 # Copyright (c) 2007-2009 Suretec Systems Ltd. - <http://www.suretecsystems.com/>
 #
-# Version: 3.1.8
+# Version: 3.1.9
 #
 # Changes:
+# - https://issues.asterisk.org/view.php?id=13725 - 12/08/2009
 # - Added AsteriskVoiceMail Object class and AstAccountCallLimit attribute - 28/05/2009
 #   https://issues.asterisk.org/view.php?id=15155
 # - Added AstAccountLastQualifyMilliseconds - 28/05/2009
@@ -96,6 +97,9 @@ olcObjectIdentifier: AstVoicemailPager AstAttrType:55
 olcObjectIdentifier: AstVoicemailOptions AstAttrType:56
 olcObjectIdentifier: AstVoicemailTimestamp AstAttrType:57
 olcObjectIdentifier: AstVoicemailContext AstAttrType:58
+olcObjectIdentifier: AstAccountSubscribeContext AstAttrType:59
+olcObjectIdentifier: AstAccountIpAddr AstAttrType:60
+olcObjectIdentifier: AstAccountUserAgent AstAttrType:61
 #
 #
 #############################################################################
@@ -551,6 +555,27 @@ olcAttributeTypes: ( AstVoicemailContext
         SUBSTR caseIgnoreSubstringsMatch
         SYNTAX 1.3.6.1.4.1.1466.115.121.1.15)
 #
+olcAttributeTypes: ( AstAccountSubscribeContext
+        NAME 'AstAccountSubscribeContext'
+        DESC 'Asterisk subscribe context'
+        EQUALITY caseIgnoreMatch
+        SUBSTR caseIgnoreSubstringsMatch
+        SYNTAX 1.3.6.1.4.1.1466.115.121.1.15)
+#
+olcAttributeTypes: ( AstAccountIpAddr
+        NAME 'AstAccountIpAddr'
+        DESC 'Asterisk aaccount IP address'
+        EQUALITY caseIgnoreMatch
+        SUBSTR caseIgnoreSubstringsMatch
+        SYNTAX 1.3.6.1.4.1.1466.115.121.1.15)
+#
+olcAttributeTypes: ( AstAccountUserAgent
+        NAME 'AstAccountUserAgent'
+        DESC 'Asterisk account user context'
+        EQUALITY caseIgnoreMatch
+        SUBSTR caseIgnoreSubstringsMatch
+        SYNTAX 1.3.6.1.4.1.1466.115.121.1.15)
+#
 #############################################################################
 # Object Class definitions
 #
diff --git a/res/res_config_ldap.c b/res/res_config_ldap.c
index aabd18a60818022c8b934a0f99168ef42966a1e9..78780d6f0f87ad79be428b5b945d5926d4178b84 100644
--- a/res/res_config_ldap.c
+++ b/res/res_config_ldap.c
@@ -1229,16 +1229,21 @@ static int update_ldap(const char *basedn, const char *table_name, const char *a
 			mods_size++;
 			ldap_mods = ast_realloc(ldap_mods, sizeof(LDAPMod *) * mods_size);
 			ldap_mods[mods_size - 1] = NULL;
+			
 			ldap_mods[mods_size - 2] = ast_calloc(1, sizeof(LDAPMod));
 
-			ldap_mods[mods_size - 2]->mod_op = LDAP_MOD_REPLACE;
-
 			ldap_mods[mods_size - 2]->mod_type = ast_calloc(sizeof(char), strlen(newparam) + 1);
 			strcpy(ldap_mods[mods_size - 2]->mod_type, newparam);
 
-			ldap_mods[mods_size - 2]->mod_values = ast_calloc(sizeof(char *), 2);
-			ldap_mods[mods_size - 2]->mod_values[0] = ast_calloc(sizeof(char), strlen(newval) + 1);
-			strcpy(ldap_mods[mods_size - 2]->mod_values[0], newval);
+			if (strlen(newval) == 0) {
+				ldap_mods[mods_size - 2]->mod_op = LDAP_MOD_DELETE;
+			} else {
+				ldap_mods[mods_size - 2]->mod_op = LDAP_MOD_REPLACE;
+
+				ldap_mods[mods_size - 2]->mod_values = ast_calloc(sizeof(char *), 2);
+				ldap_mods[mods_size - 2]->mod_values[0] = ast_calloc(sizeof(char), strlen(newval) + 1);
+				strcpy(ldap_mods[mods_size - 2]->mod_values[0], newval);
+			}
 		}
 	}
 	/* freeing ldap_mods further down */
@@ -1280,9 +1285,13 @@ static int update_ldap(const char *basedn, const char *table_name, const char *a
 	/* Ready to update */
 	if ((num_entries = ldap_count_entries(ldapConn, ldap_result_msg)) > 0) {
 		ast_debug(3, "LINE(%d) Modifying %s=%s hits: %d\n", __LINE__, attribute, lookup, num_entries);
-		for (i = 0; option_debug > 2 && i < mods_size - 1; i++)
-			ast_debug(3, "LINE(%d) %s=%s \n", __LINE__, ldap_mods[i]->mod_type, ldap_mods[i]->mod_values[0]);
-
+		for (i = 0; option_debug > 2 && i < mods_size - 1; i++) {
+			if (ldap_mods[i]->mod_op != LDAP_MOD_DELETE) {
+				ast_debug(3, "LINE(%d) %s=%s \n", __LINE__, ldap_mods[i]->mod_type, ldap_mods[i]->mod_values[0]);
+			} else {
+				ast_debug(3, "LINE(%d) deleting %s \n", __LINE__, ldap_mods[i]->mod_type);
+			}
+		}
 		ldap_entry = ldap_first_entry(ldapConn, ldap_result_msg);
 
 		for (i = 0; ldap_entry; i++) {