Make sure you are configured to allow them to loop you back. T1 -> Trunk Settings -> Response to Remote Loopback -> Respond In most cases a telco not being able to loop you is normal. However, if you use the setting above, it's possible it will allow them to loop you. -----Original Message----- From: usr-tc-bounces+adam=semo.net@mailman.xmission.com [mailto:usr-tc-bounces+adam=semo.net@mailman.xmission.com] On Behalf Of Rodney Rindels Sent: Thursday, December 23, 2004 4:33 PM To: USR-TC@mailman.xmission.com Subject: [USR-TC] TC 1000 Failing D Chanell loopback Our telco can't seem to get out D channel to loop? And specific thing I should look for in the configuration. They are equating to a possible timing issue? Thanks in Advance, Rod