diff --git a/lib/grammar.js b/lib/grammar.js
index d8178e8..fb276fb 100644
--- a/lib/grammar.js
+++ b/lib/grammar.js
@@ -45,9 +45,9 @@ var grammar = module.exports = {
     // m=video 51744 RTP/AVP 126 97 98 34 31
     // NB: special - pushes to session
     // TODO: rtp/fmtp should be filtered by the payloads found here?
-    reg: /^(\w*) (\d*) ([\w/]*)(?: (.*))?/,
-    names: ['type', 'port', 'protocol', 'payloads'],
-    format: '%s %d %s %s'
+    reg: /^(\w*) (\d*)(?:\/(\d*))? ([\w/]*)(?: (.*))?/,
+    names: ['type', 'port', 'portCount', 'protocol', 'payloads'],
+    format: '%s %d %d %s %s'
   }],
   a: [
     {