diff --git a/crosslink.py b/crosslink.py
index feba3b1..8d164ff 100755
--- a/crosslink.py
+++ b/crosslink.py
@@ -10,9 +10,15 @@ from frn.user import FRNUser
 from twisted.python import log
 
 clients = []
+talking = None
 
 class FRNCrosslinkClient(FRNClient):
 
+    def connectionMade(self):
+        self.txOk = False
+        self.txReq = False
+        FRNClient.connectionMade(self)
+
     def getClientName(self, client_id):
         if self.clientsById.has_key(client_id):
             return self.clientsById[client_id]['on']
@@ -20,6 +26,7 @@ class FRNCrosslinkClient(FRNClient):
             return client_id
 
     def textMessageReceived(self, client, message, target):
+        global clients
         if target == 'A':
             for _, _, _, factory in clients:
                 if factory != self.factory:
@@ -34,17 +41,45 @@ class FRNCrosslinkClient(FRNClient):
                         for c in factory.connection.clients:
                             cl.append("(%s)" % (c['on'],))
                         reply = ' '.join(cl)
-                        factory.connection.sendTextMessage(client, reply)
+                        self.sendTextMessage(client, reply)
+
+    def decodeTX(self, my_id):
+        log.msg("Got TX ack for %s" % self.user.ON)
+        self.txOk = True
 
     def stopTransmission(self):
         FRNClient.stopTransmission(self)
-        log.msg("Stopped playback.")
+        log.msg("Stopped TX on %s" % self.user.ON)
+
+    def goIdle(self):
+        global talking
+        self.txReq = False
+        self.txOk = False
+        talking = None
+        self.stopTransmission()
 
     def audioFrameReceived(self, from_id, frames):
+        global clients, talking
+        if talking is None or talking == self:
+            talking = self
+            for _, _, _, factory in clients:
+                conn = factory.connection
+                if conn != self:
+                    if conn.txOk:
+                        conn.txReq = False
+                        conn.sendAudioFrame(frames)
+                        conn.busyTimer.reset(5.0)
+                    else:
+                        if not conn.txReq:
+                            log.msg("Requesting TX for %s" % conn.user.ON)
+                            conn.startTransmission()
+                            conn.txReq = True
+                            conn.busyTimer = conn.factory.reactor.callLater(
+                                7.0, conn.goIdle)
         self.pong()
 
     def loginResponse(self, info):
-        log.msg("Login: %s" % info['al'])
+        log.msg("%s login: %s" % (self.user.ON, info['al']))
 
     def clientsListUpdated(self, clients):
         self.clients = clients