Chee Foong wrote: >Firewall shouldn't be a issue since the call works fine with ztdummy loaded. >I debug the chan_h323 and it uses the right codec G729 from digium. > > H.323 does NOT deal with NAT or Firewalls without a smart edge device. chan_h323 does not use ztdummy whatsoever, so that has no bearing. Jeremy McNamara