diff --git a/debian/libwireshark0.symbols b/debian/libwireshark0.symbols
index 2c745b0aa0..de8897f2ac 100644
--- a/debian/libwireshark0.symbols
+++ b/debian/libwireshark0.symbols
@@ -164,7 +164,6 @@ libwireshark.so.0 libwireshark0 #MINVER#
  conversation_key_port2@Base 2.5.0
  conversation_new@Base 1.9.1
  conversation_new_by_id@Base 2.5.0
- conversation_new_pinfo@Base 2.6.3
  conversation_pt_to_endpoint_type@Base 2.5.0
  conversation_set_dissector@Base 1.9.1
  conversation_set_dissector_from_frame_number@Base 2.0.0
@@ -633,6 +632,7 @@ libwireshark.so.0 libwireshark0 #MINVER#
  find_heur_dissector_by_unique_short_name@Base 1.99.8
  find_heur_dissector_list@Base 1.99.2
  find_or_create_conversation@Base 1.9.1
+ find_or_create_conversation_by_id@Base 2.6.3
  find_protocol_by_id@Base 1.9.1
  find_sid_name@Base 1.9.1
  find_stream_circ@Base 1.9.1
diff --git a/epan/conversation.c b/epan/conversation.c
index e1f1a03b85..fc94e3d65b 100644
--- a/epan/conversation.c
+++ b/epan/conversation.c
@@ -765,28 +765,6 @@ conversation_t *conversation_new_by_id(const guint32 setup_frame, const endpoint
 	return conversation_new(setup_frame, NULL, NULL, etype, id, 0, options | NO_ADDR2 | NO_PORT2);
 }
 
-conversation_t *
-conversation_new_pinfo(packet_info *pinfo)
-{
-	if (pinfo->use_endpoint) {
-		return conversation_new(pinfo->num,
-					&pinfo->conv_endpoint->addr1,
-					&pinfo->conv_endpoint->addr2,
-					pinfo->conv_endpoint->etype,
-					pinfo->conv_endpoint->port1,
-					pinfo->conv_endpoint->port2,
-					pinfo->conv_endpoint->options);
-	} else {
-		return conversation_new(pinfo->num,
-					&pinfo->src,
-					&pinfo->dst,
-					conversation_pt_to_endpoint_type(pinfo->ptype),
-					pinfo->srcport,
-					pinfo->destport,
-					0);
-	}
-}
-
 /*
  * Set the port 2 value in a key.  Remove the original from table,
  * update the options and port values, insert the updated key.
@@ -1519,7 +1497,29 @@ find_or_create_conversation(packet_info *pinfo)
 		DPRINT(("did not find previous conversation for frame #%u",
 				pinfo->num));
 		DINDENT();
-		conv = conversation_new_pinfo(pinfo);
+		conv = conversation_new(pinfo->num, &pinfo->src,
+					&pinfo->dst, conversation_pt_to_endpoint_type(pinfo->ptype),
+					pinfo->srcport, pinfo->destport, 0);
+		DENDENT();
+	}
+
+	DENDENT();
+
+	return conv;
+}
+
+conversation_t *
+find_or_create_conversation_by_id(packet_info *pinfo, const endpoint_type etype, const guint32 id)
+{
+	conversation_t *conv=NULL;
+
+	/* Have we seen this conversation before? */
+	if ((conv = find_conversation_by_id(pinfo->num, etype, id, 0)) == NULL) {
+		/* No, this is a new conversation. */
+		DPRINT(("did not find previous conversation for frame #%u",
+				pinfo->num));
+		DINDENT();
+		conv = conversation_new_by_id(pinfo->num, etype, id, 0);
 		DENDENT();
 	}
 
diff --git a/epan/conversation.h b/epan/conversation.h
index d1d01c7ffb..cd8d41612c 100644
--- a/epan/conversation.h
+++ b/epan/conversation.h
@@ -134,9 +134,6 @@ WS_DLL_PUBLIC conversation_t *conversation_new(const guint32 setup_frame, const
 
 WS_DLL_PUBLIC conversation_t *conversation_new_by_id(const guint32 setup_frame, const endpoint_type etype, const guint32 id, const guint options);
 
-WS_DLL_PUBLIC
-conversation_t *conversation_new_pinfo(packet_info *pinfo);
-
 /**
  * Given two address/port pairs for a packet, search for a conversation
  * containing packets between those address/port pairs.  Returns NULL if
@@ -191,6 +188,12 @@ WS_DLL_PUBLIC conversation_t *find_conversation_pinfo(packet_info *pinfo, const
  */
 WS_DLL_PUBLIC conversation_t *find_or_create_conversation(packet_info *pinfo);
 
+/**  A helper function that calls find_conversation_by_id() and, if a
+ *  conversation is not found, calls conversation_new_by_id().
+ *  The frame number is taken from pinfo.
+ */
+WS_DLL_PUBLIC conversation_t *find_or_create_conversation_by_id(packet_info *pinfo, const endpoint_type etype, const guint32 id);
+
 WS_DLL_PUBLIC void conversation_add_proto_data(conversation_t *conv, const int proto,
     void *proto_data);
 WS_DLL_PUBLIC void *conversation_get_proto_data(const conversation_t *conv, const int proto);
diff --git a/epan/dissectors/packet-isdn.c b/epan/dissectors/packet-isdn.c
index 846996b278..a2171eed83 100644
--- a/epan/dissectors/packet-isdn.c
+++ b/epan/dissectors/packet-isdn.c
@@ -96,8 +96,6 @@ dissect_isdn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_
 		col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "Network");
 	}
 
-	conversation_create_endpoint_by_id(pinfo, ENDPOINT_ISDN, pinfo->pseudo_header->isdn.channel, 0);
-
 	if (tree) {
 		ti = proto_tree_add_item(tree, proto_isdn, tvb, 0, 0, ENC_NA);
 		isdn_tree = proto_item_add_subtree(ti, ett_isdn);
@@ -109,7 +107,8 @@ dissect_isdn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_
 	/*
 	 * Set up a circuit for this channel, and assign it a dissector.
 	 */
-	conv = find_or_create_conversation(pinfo);
+	conv = find_or_create_conversation_by_id(pinfo, ENDPOINT_ISDN,
+	    pinfo->pseudo_header->isdn.channel);
 
 	if (conversation_get_dissector(conv, 0) == NULL) {
 		/*