diff --git a/src/main/java/io/github/dsheirer/module/decode/mpt1327/MPT1327DecoderState.java b/src/main/java/io/github/dsheirer/module/decode/mpt1327/MPT1327DecoderState.java
index 76fc5ffd..064bfc4f 100644
--- a/src/main/java/io/github/dsheirer/module/decode/mpt1327/MPT1327DecoderState.java
+++ b/src/main/java/io/github/dsheirer/module/decode/mpt1327/MPT1327DecoderState.java
@@ -205,7 +205,10 @@ public class MPT1327DecoderState extends DecoderState
                     case GTC:
                         if(mMPT1327TrafficChannelManager != null)
                         {
-                            mMPT1327TrafficChannelManager.processChannelGrant(mpt);
+                            MutableIdentifierCollection ic = new MutableIdentifierCollection(getIdentifierCollection().getIdentifiers());
+                            ic.remove(IdentifierClass.USER);
+                            ic.update(mpt.getIdentifiers());
+                            mMPT1327TrafficChannelManager.processChannelGrant(mpt, ic);
                         }
                         else
                         {
diff --git a/src/main/java/io/github/dsheirer/module/decode/mpt1327/MPT1327TrafficChannelManager.java b/src/main/java/io/github/dsheirer/module/decode/mpt1327/MPT1327TrafficChannelManager.java
index 347e6c69..1c01fdc5 100644
--- a/src/main/java/io/github/dsheirer/module/decode/mpt1327/MPT1327TrafficChannelManager.java
+++ b/src/main/java/io/github/dsheirer/module/decode/mpt1327/MPT1327TrafficChannelManager.java
@@ -81,11 +81,10 @@ public class MPT1327TrafficChannelManager extends Module implements IDecodeEvent
      * Processes channel grants to allocate traffic channels and track overall channel usage.  Generates
      * decode events for each new channel that is allocated.
      */
-    public void processChannelGrant(MPT1327Message mpt1327Message)
+    public void processChannelGrant(MPT1327Message mpt1327Message, IdentifierCollection identifierCollection)
     {
         if(mpt1327Message.getMessageType() == MPT1327Message.MPTMessageType.GTC)
         {
-            IdentifierCollection identifierCollection = new IdentifierCollection(mpt1327Message.getIdentifiers());
             MPT1327Channel mpt1327Channel = MPT1327Channel.create(mpt1327Message.getChannel());
             mpt1327Channel.setChannelMap(mChannelMap);