Hello everyone,Up for sale is my Telos Zephyr XStream ISDN Codec.  Absolutely excellent condition.  Has been racked in a smoke free environment.  Perfect working order.  Comes well packed in the original Telos shipping box.  Manual is available online.Beware of most of the other "Zephyr" models available on eBay, as they are earlier and/or lesser models than the XStream.  Be careful, because you want to make sure you have the best product for your important ISDN work. From the Telos website:Zephyr Xstream is the world’s leading ISDN codec, compatible with the widest variety of third party codecs. Coding choices include MPEG4-AAC and AAC-LD, Layer 2, Layer 3 & G.722 coding for full-duplex stereo operation of up to 20 kHz audio on a single ISDN line; broadcast quality mono audio at 15 kHz or 20 kHz is possible on a single ISDN “B” channel or other 56/64 kbps channel. All Xstream models feature professional balanced analog inputs/outputs, as well as Livewire® I/O for quick connection to Axia® networks; AES/EBU I/O is standard on rackmount model. An ISDN TA with integral NT1 provides worldwide ISDN compatibility without software changes. Remote Control is possible over RS-232 or Ethernet. Insured shipping in the continental US will be $39.95.  Outside of that area will be $69.95.  Local pickup (cash only) in Burbank, CA is also fine.Thanks for looking at this great item!