diff --git a/sylk/applications/conference/configuration.py b/sylk/applications/conference/configuration.py
index bc9e9d6..f39b068 100644
--- a/sylk/applications/conference/configuration.py
+++ b/sylk/applications/conference/configuration.py
@@ -1,133 +1,133 @@
 # Copyright (C) 2010-2011 AG Projects. See LICENSE for details.
 #
 
 __all__ = ['ConferenceConfig', 'get_room_config']
 
 import os
 import re
 
 from application.configuration import ConfigFile, ConfigSection, ConfigSetting
 from application.configuration.datatypes import StringList
 
 from sylk.configuration import ServerConfig
 from sylk.configuration.datatypes import Path, URL
 
 
 # Datatypes
 
 class AccessPolicyValue(str):
     allowed_values = ('allow,deny', 'deny,allow')
 
     def __new__(cls, value):
         value = re.sub('\s', '', value)
         if value not in cls.allowed_values:
             raise ValueError('invalid value, allowed values are: %s' % ' | '.join(cls.allowed_values))
         return str.__new__(cls, value)
 
 
 class Domain(str):
     domain_re = re.compile(r"^[a-zA-Z0-9\-_]+(\.[a-zA-Z0-9\-_]+)*$")
 
     def __new__(cls, value):
         value = str(value)
         if not cls.domain_re.match(value):
             raise ValueError("illegal domain: %s" % value)
         return str.__new__(cls, value)
 
 
 class SIPAddress(str):
     def __new__(cls, address):
         address = str(address)
         address = address.replace('@', '%40', address.count('@')-1)
         try:
             username, domain = address.split('@')
             Domain(domain)
         except ValueError:
             raise ValueError("illegal SIP address: %s, must be in user@domain format" % address)
         return str.__new__(cls, address)
 
 
 class PolicySettingValue(list):
     def __init__(self, value):
         if isinstance(value, (tuple, list)):
             l = [str(x) for x in value]
         elif isinstance(value, basestring):
             if value.lower() in ('none', ''):
                 return list.__init__(self, [])
             elif value.lower() in ('any', 'all', '*'):
                 return list.__init__(self, ['*'])
             else:
                 l = re.split(r'\s*,\s*', value)
         else:
             raise TypeError("value must be a string, list or tuple")
         values = []
         for item in l:
             if '@' in item:
                 values.append(SIPAddress(item))
             else:
                 values.append(Domain(item))
         return list.__init__(self, values)
 
     def match(self, uri):
         if self == ['*']:
             return True
         domain = uri.host
         uri = re.sub('^(sip:|sips:)', '', str(uri))
         return uri in self or domain in self
 
 
 # Configuration objects
 
 class ConferenceConfig(ConfigSection):
     __cfgfile__ = 'conference.ini'
     __section__ = 'Conference'
 
     history_size = 20
 
     access_policy = ConfigSetting(type=AccessPolicyValue, value=AccessPolicyValue('allow, deny'))
     allow = ConfigSetting(type=PolicySettingValue, value=PolicySettingValue('all'))
     deny = ConfigSetting(type=PolicySettingValue, value=PolicySettingValue('none'))
 
     file_transfer_dir = ConfigSetting(type=Path, value=Path(os.path.join(ServerConfig.spool_dir.normalized, 'conference', 'files')))
     push_file_transfer = False
 
     screensharing_images_dir = ConfigSetting(type=Path, value=Path(os.path.join(ServerConfig.spool_dir.normalized, 'conference', 'screensharing')))
 
     advertise_xmpp_support = True
     pstn_access_numbers = ConfigSetting(type=StringList, value='')
     webrtc_gateway_url = ConfigSetting(type=URL, value='')
 
     zrtp_auto_verify = True
 
 
 class RoomConfig(ConfigSection):
     __cfgfile__ = 'conference.ini'
 
     access_policy = ConfigSetting(type=AccessPolicyValue, value=AccessPolicyValue('allow, deny'))
     allow = ConfigSetting(type=PolicySettingValue, value=PolicySettingValue('all'))
     deny = ConfigSetting(type=PolicySettingValue, value=PolicySettingValue('none'))
 
-    pstn_access_numbers = ConferenceConfig.pstn_access_numbers
+    pstn_access_numbers = ConfigSetting(type=StringList, value=ConferenceConfig.pstn_access_numbers)
     advertise_xmpp_support = ConferenceConfig.advertise_xmpp_support
     webrtc_gateway_url = ConferenceConfig.webrtc_gateway_url
 
     zrtp_auto_verify = ConferenceConfig.zrtp_auto_verify
 
 
 class Configuration(object):
     def __init__(self, data):
         self.__dict__.update(data)
 
 
 def get_room_config(room):
     config_file = ConfigFile(RoomConfig.__cfgfile__)
     section = config_file.get_section(room)
     if section is not None:
         RoomConfig.read(section=room)
         config = Configuration(dict(RoomConfig))
         RoomConfig.reset()
     else:
         # Apply general policy
         config = Configuration(dict(RoomConfig))
     return config