diff --git a/indra/newview/llcallfloater.cpp b/indra/newview/llcallfloater.cpp
index 1e713dade8b411d880c40d5b3f89c39516ec9dc1..f62fd44bc06df85be868102c9669383d62fb9e06 100644
--- a/indra/newview/llcallfloater.cpp
+++ b/indra/newview/llcallfloater.cpp
@@ -163,6 +163,8 @@ BOOL LLCallFloater::postBuild()
 	//chrome="true" hides floater caption 
 	if (mDragHandle)
 		mDragHandle->setTitleVisible(TRUE);
+	
+	updateSession();
 
 	return TRUE;
 }
@@ -246,7 +248,7 @@ void LLCallFloater::updateSession()
 		}
 	}
 
-	const LLUUID& session_id = voice_channel->getSessionID();
+	const LLUUID& session_id = voice_channel ? voice_channel->getSessionID() : LLUUID::null;
 	lldebugs << "Set speaker manager for session: " << session_id << llendl;
 
 	LLIMModel::LLIMSession* im_session = LLIMModel::getInstance()->findIMSession(session_id);
diff --git a/indra/newview/llparticipantlist.cpp b/indra/newview/llparticipantlist.cpp
index f83f3eba968a4215ea8f021f6fa5ac3bbbdfca2e..d54cbfe20317458cfc313fc2a3df8559fd567c3a 100644
--- a/indra/newview/llparticipantlist.cpp
+++ b/indra/newview/llparticipantlist.cpp
@@ -433,6 +433,12 @@ LLContextMenu* LLParticipantList::LLParticipantListMenu::createMenu()
 	LLContextMenu* main_menu = LLUICtrlFactory::getInstance()->createFromFile<LLContextMenu>(
 		"menu_participant_list.xml", LLMenuGL::sMenuContainer, LLViewerMenuHolderGL::child_registry_t::instance());
 
+	// AD *TODO: This is workaround for EXT-4725- way to properly enable/disable "Call" menu item in
+	// enableContextMenuItem() should be found.
+	bool not_agent = mUUIDs.front() != gAgentID;
+	bool can_call = not_agent && LLVoiceClient::voiceEnabled() && gVoiceClient->voiceWorking();
+	main_menu->setItemEnabled("Call", can_call);
+
 	// Don't show sort options for P2P chat
 	bool is_sort_visible = (mParent.mAvatarList && mParent.mAvatarList->size() > 1);
 	main_menu->setItemVisible("SortByName", is_sort_visible);
diff --git a/indra/newview/skins/default/xui/en/menu_participant_list.xml b/indra/newview/skins/default/xui/en/menu_participant_list.xml
index 805ffbae6688f1a0f6622e5fdeca6224c9d02829..04e02d0f6cc6e3500a322f572f46b5423720952f 100644
--- a/indra/newview/skins/default/xui/en/menu_participant_list.xml
+++ b/indra/newview/skins/default/xui/en/menu_participant_list.xml
@@ -57,9 +57,6 @@
      name="Call">
          <menu_item_call.on_click
          function="Avatar.Call" />
-        <menu_item_call.on_enable
-         function="ParticipantList.EnableItem"
-         parameter="can_call" />
     </menu_item_call>
     <menu_item_call
      enabled="true"