<span style="font-family: Arial, Helvetica, sans-serif; font-size: 10pt">Jeff<br />
<br />
The grandstream units support both Relay and passthru depending on how you set them up. <br />
<br />
<div>Thanks<br />
<br />
Bryant Zimmerman (ZK Tech Inc.)<br />
616-855-1030 Ext. 2003</div></span>