Switched DTMF batch implementation to use deque

src/common/jingle_rtp.py

@@ -15,6 +15,8 @@
 Handles Jingle RTP sessions (XEP 0167)
 """
 
+from collections import deque
+
 import gobject
 import socket
 
@@ -122,15 +124,15 @@ class JingleRTPContent(JingleContent):
         """
         if self._dtmf_running:
             raise Exception("There is a DTMF batch already running")
-        events = list(events)
+        events = deque(events)
         self._dtmf_running = True
-        self._start_dtmf(events.pop(0))
+        self._start_dtmf(events.popleft())
         gobject.timeout_add(500, self._next_dtmf, events)
 
     def _next_dtmf(self, events):
         self._stop_dtmf()
         if events:
-            self._start_dtmf(events.pop(0))
+            self._start_dtmf(events.popleft())
             gobject.timeout_add(500, self._next_dtmf, events)
         else:
             self._dtmf_running = False