diff --git a/sipsimple/configuration/settings.py b/sipsimple/configuration/settings.py
index f4fd1af5..6d7b5ce2 100644
--- a/sipsimple/configuration/settings.py
+++ b/sipsimple/configuration/settings.py
@@ -1,109 +1,111 @@
 
 """
 SIP SIMPLE settings.
 
 Definition of general (non-account related) settings.
 """
 
 from sipsimple import __version__
 from sipsimple.configuration import CorrelatedSetting, RuntimeSetting, Setting, SettingsGroup, SettingsObject
 from sipsimple.configuration.datatypes import NonNegativeInteger, PJSIPLogLevel
 from sipsimple.configuration.datatypes import AudioCodecList, SampleRate, VideoCodecList
 from sipsimple.configuration.datatypes import Port, PortRange, SIPTransportList
 from sipsimple.configuration.datatypes import Path
 from sipsimple.configuration.datatypes import H264Profile, VideoResolution
 
-
 __all__ = ['SIPSimpleSettings']
 
 
+
 class EchoCancellerSettings(SettingsGroup):
     enabled = Setting(type=bool, default=True)
     tail_length = Setting(type=NonNegativeInteger, default=2)
 
 
 class AudioSettings(SettingsGroup):
     alert_device = Setting(type=str, default='system_default', nillable=True)
     input_device = Setting(type=str, default='system_default', nillable=True)
     output_device = Setting(type=str, default='system_default', nillable=True)
     sample_rate = Setting(type=SampleRate, default=44100)
     muted = RuntimeSetting(type=bool, default=False)
     silent = Setting(type=bool, default=False)
     echo_canceller = EchoCancellerSettings
 
 
 class H264Settings(SettingsGroup):
     profile = Setting(type=H264Profile, default='baseline')
     level = Setting(type=str, default='3.1')
 
 
 class VideoSettings(SettingsGroup):
     device = Setting(type=str, default='system_default', nillable=True)
     resolution = Setting(type=VideoResolution, default=VideoResolution('1280x720'))
     framerate = Setting(type=int, default=25)
     max_bitrate = Setting(type=float, default=None, nillable=True)
     muted = RuntimeSetting(type=bool, default=False)
     h264 = H264Settings
 
 
 class ChatSettings(SettingsGroup):
     pass
 
 
 class ScreenSharingSettings(SettingsGroup):
     pass
 
 
 class FileTransferSettings(SettingsGroup):
     directory = Setting(type=Path, default=Path('~/Downloads'))
 
 
 class LogsSettings(SettingsGroup):
     trace_msrp = Setting(type=bool, default=False)
     trace_sip = Setting(type=bool, default=False)
     trace_pjsip = Setting(type=bool, default=False)
     pjsip_level = Setting(type=PJSIPLogLevel, default=5)
 
-
-class RTPSettings(SettingsGroup):
-    port_range = Setting(type=PortRange, default=PortRange(50000, 50500))
-    timeout = Setting(type=NonNegativeInteger, default=30)
-    audio_codec_list = Setting(type=AudioCodecList, default=AudioCodecList(('opus', 'G722', 'PCMU', 'PCMA', 'speex', 'iLBC', 'GSM')))
-    video_codec_list = Setting(type=VideoCodecList, default=VideoCodecList(('H264', 'VP8', 'VP9')))
+try:
+    from sipsimple.configuration._codecs import RTPSettings
+except ImportError:
+    class RTPSettings(SettingsGroup):
+        port_range = Setting(type=PortRange, default=PortRange(50000, 50500))
+        timeout = Setting(type=NonNegativeInteger, default=30)
+        audio_codec_list = Setting(type=AudioCodecList, default=AudioCodecList(('opus', 'G722', 'PCMU', 'PCMA', 'speex', 'iLBC', 'GSM')))
+        video_codec_list = Setting(type=VideoCodecList, default=VideoCodecList(('H264', 'VP8', 'VP9')))
 
 
 def sip_port_validator(port, sibling_port):
     if port == sibling_port != 0:
         raise ValueError("the TCP and TLS ports must be different")
 
 class SIPSettings(SettingsGroup):
     invite_timeout = Setting(type=NonNegativeInteger, default=90, nillable=True)
     udp_port = Setting(type=Port, default=0)
     tcp_port = CorrelatedSetting(type=Port, sibling='tls_port', validator=sip_port_validator, default=0)
     tls_port = CorrelatedSetting(type=Port, sibling='tcp_port', validator=sip_port_validator, default=0)
     transport_list = Setting(type=SIPTransportList, default=SIPTransportList(('tls', 'tcp', 'udp')))
 
 
 class TLSSettings(SettingsGroup):
     ca_list = Setting(type=Path, default=None, nillable=True)
     certificate = Setting(type=Path, default=None, nillable=True)
     verify_server = Setting(type=bool, default=False)
 
 class SIPSimpleSettings(SettingsObject):
     __id__ = 'SIPSimpleSettings'
 
     default_account = Setting(type=str, default='bonjour@local', nillable=True)
     user_agent = Setting(type=str, default='sipsimple %s' % __version__)
     instance_id = Setting(type=str, default='')
 
     audio = AudioSettings
     video = VideoSettings
     chat = ChatSettings
     screen_sharing = ScreenSharingSettings
     file_transfer = FileTransferSettings
     logs = LogsSettings
     rtp = RTPSettings
     sip = SIPSettings
     tls = TLSSettings