Several options come immediately to mind:
1) christianlov's Multiphone includes a 'power invite' feature:
http://www.modthesims.info/download.php?t=2937932) You could always use a summoner or teleporter to bring a Sim over directly, bypassing an invite. Insimenator (no longer supported) includes a summoner, or Inge has teleporters available:
http://www.simlogical.com/sl/Sims2Pages/Sims2_Teleporters.htm