Sangoma UT50 Asterisk Voice Time USB Clock Timing Synchronize Tool<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Use this simple USB Clock to synchronize IP signals when you are not running PSTN hardware</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31ljbOJ0iiL.jpg" noproxy>