diff --git a/src/lib.rs b/src/lib.rs
index 6ba16ea..8f8dd22 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,13 +1,14 @@
 #[macro_use]
 extern crate trackable;
 extern crate handy_async;
+extern crate crypto;
 
 pub use error::{Error, ErrorKind};
 
 pub mod io;
-pub mod packet;
 pub mod traits;
 pub mod rfc3550;
+pub mod rfc3711;
 pub mod rfc4585;
 pub mod rfc5761;
 
diff --git a/src/packet.rs b/src/packet.rs
deleted file mode 100644
index 8108cd8..0000000
--- a/src/packet.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-use io::{ReadFrom, WriteTo};
-
-pub trait Packet: ReadFrom + WriteTo {}
diff --git a/src/rfc3550/rtcp.rs b/src/rfc3550/rtcp.rs
index 1f591c4..a47c769 100644
--- a/src/rfc3550/rtcp.rs
+++ b/src/rfc3550/rtcp.rs
@@ -3,8 +3,7 @@ use handy_async::sync_io::{ReadExt, WriteExt};
 
 use {Result, ErrorKind};
 use io::{ReadFrom, WriteTo};
-use packet::Packet;
-use traits;
+use traits::{self, Packet};
 use types::{U5, U24, RtpTimestamp, NtpTimestamp, NtpMiddleTimetamp, Ssrc, SsrcOrCsrc};
 use constants::RTP_VERSION;
 
@@ -25,16 +24,13 @@ pub const SDES_ITEM_TYPE_NOTE: u8 = 7;
 pub const SDES_ITEM_TYPE_PRIV: u8 = 8;
 
 #[derive(Debug, Clone, PartialEq, Eq)]
-pub enum RtcpPacket {
-    Sr(RtcpSenderReport),
-    Rr(RtcpReceiverReport),
-    Sdes(RtcpSourceDescription),
-    Bye(RtcpGoodbye),
-    App(RtcpApplicationDefined),
-}
-impl Packet for RtcpPacket {}
-impl traits::RtcpPacket for RtcpPacket {
-    fn supports_type(ty: u8) -> bool {
+pub struct RtcpPacketReader;
+impl traits::ReadPacket for RtcpPacketReader {
+    type Packet = RtcpPacket;
+    fn read_packet<R: Read>(&mut self, reader: &mut R) -> Result<Self::Packet> {
+        RtcpPacket::read_from(reader)
+    }
+    fn supports_type(&self, ty: u8) -> bool {
         match ty {
             RTCP_PACKET_TYPE_SR |
             RTCP_PACKET_TYPE_RR |
@@ -45,6 +41,26 @@ impl traits::RtcpPacket for RtcpPacket {
         }
     }
 }
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct RtcpPacketWriter;
+impl traits::WritePacket for RtcpPacketWriter {
+    type Packet = RtcpPacket;
+    fn write_packet<W: Write>(&mut self, writer: &mut W, packet: &Self::Packet) -> Result<()> {
+        packet.write_to(writer)
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum RtcpPacket {
+    Sr(RtcpSenderReport),
+    Rr(RtcpReceiverReport),
+    Sdes(RtcpSourceDescription),
+    Bye(RtcpGoodbye),
+    App(RtcpApplicationDefined),
+}
+impl Packet for RtcpPacket {}
+impl traits::RtcpPacket for RtcpPacket {}
 impl ReadFrom for RtcpPacket {
     fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
         let mut buf = [0; 2];
@@ -186,11 +202,7 @@ impl RtcpSenderReport {
     }
 }
 impl Packet for RtcpSenderReport {}
-impl traits::RtcpPacket for RtcpSenderReport {
-    fn supports_type(ty: u8) -> bool {
-        ty == RTCP_PACKET_TYPE_SR
-    }
-}
+impl traits::RtcpPacket for RtcpSenderReport {}
 impl ReadFrom for RtcpSenderReport {
     fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
         let (reception_report_count, payload) = track_try!(read_sctp(reader, RTCP_PACKET_TYPE_SR));
@@ -320,11 +332,7 @@ impl RtcpReceiverReport {
     }
 }
 impl Packet for RtcpReceiverReport {}
-impl traits::RtcpPacket for RtcpReceiverReport {
-    fn supports_type(ty: u8) -> bool {
-        ty == RTCP_PACKET_TYPE_RR
-    }
-}
+impl traits::RtcpPacket for RtcpReceiverReport {}
 impl ReadFrom for RtcpReceiverReport {
     fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
         let (reception_report_count, payload) = track_try!(read_sctp(reader, RTCP_PACKET_TYPE_RR));
@@ -375,11 +383,7 @@ impl RtcpSourceDescription {
     }
 }
 impl Packet for RtcpSourceDescription {}
-impl traits::RtcpPacket for RtcpSourceDescription {
-    fn supports_type(ty: u8) -> bool {
-        ty == RTCP_PACKET_TYPE_SDES
-    }
-}
+impl traits::RtcpPacket for RtcpSourceDescription {}
 impl ReadFrom for RtcpSourceDescription {
     fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
         let (source_count, payload) = track_try!(read_sctp(reader, RTCP_PACKET_TYPE_SDES));
@@ -530,11 +534,7 @@ impl RtcpGoodbye {
     }
 }
 impl Packet for RtcpGoodbye {}
-impl traits::RtcpPacket for RtcpGoodbye {
-    fn supports_type(ty: u8) -> bool {
-        ty == RTCP_PACKET_TYPE_BYE
-    }
-}
+impl traits::RtcpPacket for RtcpGoodbye {}
 impl ReadFrom for RtcpGoodbye {
     fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
         let (source_count, payload) = track_try!(read_sctp(reader, RTCP_PACKET_TYPE_BYE));
@@ -585,11 +585,7 @@ pub struct RtcpApplicationDefined {
     pub data: Vec<u8>,
 }
 impl Packet for RtcpApplicationDefined {}
-impl traits::RtcpPacket for RtcpApplicationDefined {
-    fn supports_type(ty: u8) -> bool {
-        ty == RTCP_PACKET_TYPE_APP
-    }
-}
+impl traits::RtcpPacket for RtcpApplicationDefined {}
 impl ReadFrom for RtcpApplicationDefined {
     fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
         let (subtype, payload) = track_try!(read_sctp(reader, RTCP_PACKET_TYPE_APP));
diff --git a/src/rfc3550/rtp.rs b/src/rfc3550/rtp.rs
index 01c18cb..8336e4a 100644
--- a/src/rfc3550/rtp.rs
+++ b/src/rfc3550/rtp.rs
@@ -3,11 +3,31 @@ use handy_async::sync_io::{ReadExt, WriteExt};
 
 use {Result, ErrorKind};
 use io::{ReadFrom, WriteTo};
-use packet::Packet;
-use traits;
+use traits::{self, Packet};
 use types::{U7, RtpTimestamp, Ssrc, Csrc};
 use constants::RTP_VERSION;
 
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct RtpPacketReader;
+impl traits::ReadPacket for RtpPacketReader {
+    type Packet = RtpPacket;
+    fn read_packet<R: Read>(&mut self, reader: &mut R) -> Result<Self::Packet> {
+        RtpPacket::read_from(reader)
+    }
+    fn supports_type(&self, _ty: u8) -> bool {
+        true
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct RtpPacketWriter;
+impl traits::WritePacket for RtpPacketWriter {
+    type Packet = RtpPacket;
+    fn write_packet<W: Write>(&mut self, writer: &mut W, packet: &Self::Packet) -> Result<()> {
+        packet.write_to(writer)
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct RtpPacket {
     pub header: RtpFixedHeader,
@@ -15,11 +35,7 @@ pub struct RtpPacket {
     pub padding: Vec<u8>,
 }
 impl Packet for RtpPacket {}
-impl traits::RtpPacket for RtpPacket {
-    fn supports_type(_ty: U7) -> bool {
-        true
-    }
-}
+impl traits::RtpPacket for RtpPacket {}
 impl ReadFrom for RtpPacket {
     fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
         let header = track_try!(RtpFixedHeader::read_from(reader));
diff --git a/src/rfc4585.rs b/src/rfc4585.rs
index 4c9a37c..9a523f8 100644
--- a/src/rfc4585.rs
+++ b/src/rfc4585.rs
@@ -3,8 +3,7 @@ use handy_async::sync_io::{ReadExt, WriteExt};
 
 use {Result, ErrorKind};
 use io::{ReadFrom, WriteTo};
-use packet::Packet;
-use traits;
+use traits::{self, Packet};
 use types::{U5, U6, U7, U13, Ssrc};
 use constants::RTP_VERSION;
 use rfc3550;
@@ -20,18 +19,13 @@ pub const PSFB_MESSAGE_TYPE_RPSI: u8 = 3;
 pub const PSFB_MESSAGE_TYPE_AFB: u8 = 15;
 
 #[derive(Debug, Clone, PartialEq, Eq)]
-pub enum RtcpPacket {
-    Sr(rfc3550::RtcpSenderReport),
-    Rr(rfc3550::RtcpReceiverReport),
-    Sdes(rfc3550::RtcpSourceDescription),
-    Bye(rfc3550::RtcpGoodbye),
-    App(rfc3550::RtcpApplicationDefined),
-    Rtpfb(RtcpTransportLayerFeedback),
-    Psfb(RtcpPayloadSpecificFeedback),
-}
-impl Packet for RtcpPacket {}
-impl traits::RtcpPacket for RtcpPacket {
-    fn supports_type(ty: u8) -> bool {
+pub struct RtcpPacketReader;
+impl traits::ReadPacket for RtcpPacketReader {
+    type Packet = RtcpPacket;
+    fn read_packet<R: Read>(&mut self, reader: &mut R) -> Result<Self::Packet> {
+        RtcpPacket::read_from(reader)
+    }
+    fn supports_type(&self, ty: u8) -> bool {
         match ty {
             rfc3550::RTCP_PACKET_TYPE_SR |
             rfc3550::RTCP_PACKET_TYPE_RR |
@@ -44,6 +38,28 @@ impl traits::RtcpPacket for RtcpPacket {
         }
     }
 }
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct RtcpPacketWriter;
+impl traits::WritePacket for RtcpPacketWriter {
+    type Packet = RtcpPacket;
+    fn write_packet<W: Write>(&mut self, writer: &mut W, packet: &Self::Packet) -> Result<()> {
+        packet.write_to(writer)
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum RtcpPacket {
+    Sr(rfc3550::RtcpSenderReport),
+    Rr(rfc3550::RtcpReceiverReport),
+    Sdes(rfc3550::RtcpSourceDescription),
+    Bye(rfc3550::RtcpGoodbye),
+    App(rfc3550::RtcpApplicationDefined),
+    Rtpfb(RtcpTransportLayerFeedback),
+    Psfb(RtcpPayloadSpecificFeedback),
+}
+impl Packet for RtcpPacket {}
+impl traits::RtcpPacket for RtcpPacket {}
 impl ReadFrom for RtcpPacket {
     fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
         let mut buf = [0; 2];
@@ -136,11 +152,7 @@ pub enum RtcpTransportLayerFeedback {
     Nack(GenericNack),
 }
 impl Packet for RtcpTransportLayerFeedback {}
-impl traits::RtcpPacket for RtcpTransportLayerFeedback {
-    fn supports_type(ty: u8) -> bool {
-        ty == RTCP_PACKET_TYPE_RTPFB
-    }
-}
+impl traits::RtcpPacket for RtcpTransportLayerFeedback {}
 impl ReadFrom for RtcpTransportLayerFeedback {
     fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
         let (fb_message_type, rest) = track_try!(read_common(reader, RTCP_PACKET_TYPE_RTPFB));
@@ -183,11 +195,7 @@ pub enum RtcpPayloadSpecificFeedback {
     Afb(ApplicationLayerFeedback),
 }
 impl Packet for RtcpPayloadSpecificFeedback {}
-impl traits::RtcpPacket for RtcpPayloadSpecificFeedback {
-    fn supports_type(ty: u8) -> bool {
-        ty == RTCP_PACKET_TYPE_RTPFB
-    }
-}
+impl traits::RtcpPacket for RtcpPayloadSpecificFeedback {}
 impl ReadFrom for RtcpPayloadSpecificFeedback {
     fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
         let (fb_message_type, rest) = track_try!(read_common(reader, RTCP_PACKET_TYPE_PSFB));
diff --git a/src/rfc5761.rs b/src/rfc5761.rs
index f5f639a..247bce1 100644
--- a/src/rfc5761.rs
+++ b/src/rfc5761.rs
@@ -1,9 +1,83 @@
 use std::io::{Read, Write};
 
-use {Result, ErrorKind};
-use io::{ReadFrom, WriteTo};
-use traits::{RtpPacket, RtcpPacket};
-use packet::Packet;
+use {Result};
+use traits::{ReadPacket, WritePacket, RtpPacket, RtcpPacket, Packet};
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct MuxPacketReader<T, U> {
+    rtp_reader: T,
+    rtcp_reader: U,
+}
+impl<T, U> MuxPacketReader<T, U>
+    where T: ReadPacket,
+          T::Packet: RtpPacket,
+          U: ReadPacket,
+          U::Packet: RtcpPacket
+{
+    pub fn new(rtp_reader: T, rtcp_reader: U) -> Self {
+        MuxPacketReader {
+            rtp_reader: rtp_reader,
+            rtcp_reader: rtcp_reader,
+        }
+    }
+}
+impl<T, U> ReadPacket for MuxPacketReader<T, U>
+    where T: ReadPacket,
+          T::Packet: RtpPacket,
+          U: ReadPacket,
+          U::Packet: RtcpPacket
+{
+    type Packet = MuxedPacket<T::Packet, U::Packet>;
+    fn read_packet<R: Read>(&mut self, reader: &mut R) -> Result<Self::Packet> {
+        let mut buf = [0; 2];
+        track_try!(reader.read_exact(&mut buf));
+
+        let ty = buf[1];
+        if self.rtcp_reader.supports_type(ty) {
+            let reader = &mut (&buf[..]).chain(reader);
+            track_err!(self.rtcp_reader.read_packet(reader).map(MuxedPacket::Rtcp))
+        } else {
+            let reader = &mut (&buf[..]).chain(reader);
+            track_err!(self.rtp_reader.read_packet(reader).map(MuxedPacket::Rtp))
+        }
+    }
+    fn supports_type(&self, ty: u8) -> bool {
+        self.rtp_reader.supports_type(ty) || self.rtcp_reader.supports_type(ty)
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct MuxPacketWriter<T, U> {
+    rtp_writer: T,
+    rtcp_writer: U,
+}
+impl<T, U> MuxPacketWriter<T, U>
+    where T: WritePacket,
+          T::Packet: RtpPacket,
+          U: WritePacket,
+          U::Packet: RtcpPacket
+{
+    pub fn new(rtp_writer: T, rtcp_writer: U) -> Self {
+        MuxPacketWriter {
+            rtp_writer: rtp_writer,
+            rtcp_writer: rtcp_writer,
+        }
+    }
+}
+impl<T, U> WritePacket for MuxPacketWriter<T, U>
+    where T: WritePacket,
+          T::Packet: RtpPacket,
+          U: WritePacket,
+          U::Packet: RtcpPacket
+{
+    type Packet = MuxedPacket<T::Packet, U::Packet>;
+    fn write_packet<W: Write>(&mut self, writer: &mut W, packet: &Self::Packet) -> Result<()> {
+        match *packet {
+            MuxedPacket::Rtp(ref p) => self.rtp_writer.write_packet(writer, p),
+            MuxedPacket::Rtcp(ref p) => self.rtcp_writer.write_packet(writer, p),            
+        }
+    }
+}
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum MuxedPacket<T, U> {
@@ -15,37 +89,3 @@ impl<T, U> Packet for MuxedPacket<T, U>
           U: RtcpPacket
 {
 }
-impl<T, U> ReadFrom for MuxedPacket<T, U>
-    where T: RtpPacket,
-          U: RtcpPacket
-{
-    fn read_from<R: Read>(reader: &mut R) -> Result<Self> {
-        let mut buf = [0; 2];
-        track_try!(reader.read_exact(&mut buf));
-
-        let ty = buf[1];
-        if U::supports_type(ty) {
-            let reader = &mut (&buf[..]).chain(reader);
-            track_err!(U::read_from(reader).map(MuxedPacket::Rtcp))
-        } else if T::supports_type(ty & 0b0111_1111) {
-            let reader = &mut (&buf[..]).chain(reader);
-            track_err!(T::read_from(reader).map(MuxedPacket::Rtp))
-        } else {
-            track_panic!(ErrorKind::Unsupported,
-                         "Unknown packet/payload type: {}",
-                         ty)
-        }
-    }
-}
-impl<T, U> WriteTo for MuxedPacket<T, U>
-    where T: RtpPacket,
-          U: RtcpPacket
-{
-    fn write_to<W: Write>(&self, writer: &mut W) -> Result<()> {
-        match *self {
-            MuxedPacket::Rtp(ref p) => track_try!(p.write_to(writer)),
-            MuxedPacket::Rtcp(ref p) => track_try!(p.write_to(writer)),
-        }
-        Ok(())
-    }
-}
diff --git a/src/traits.rs b/src/traits.rs
index ed3e2fd..3aafcdf 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -1,9 +1,20 @@
-use packet::Packet;
-use types::U7;
+use std::io::{Read, Write};
 
-pub trait RtpPacket: Packet {
-    fn supports_type(payload_type: U7) -> bool;
+use Result;
+
+pub trait Packet {}
+
+// TODO: DecodePacket(?)
+pub trait ReadPacket {
+    type Packet: Packet;
+    fn read_packet<R: Read>(&mut self, reader: &mut R) -> Result<Self::Packet>;
+    fn supports_type(&self, packet_type: u8) -> bool;
 }
-pub trait RtcpPacket: Packet {
-    fn supports_type(packet_type: u8) -> bool;
+
+pub trait WritePacket {
+    type Packet: Packet;
+    fn write_packet<W: Write>(&mut self, writer: &mut W, packet: &Self::Packet) -> Result<()>;
 }
+
+pub trait RtpPacket: Packet {}
+pub trait RtcpPacket: Packet {}