This is what I understand... but looking for an expert view from someone else. Dahdi - Asterisk & hardware device interface Asterisk - telephony switching and PBX service Libpri - protocols used by Asterisk/Dahdi? Zaptel - interface functionally similar to, and predating Dahdi? Bob kk6ecm _____ From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of George Csahanin Sent: Thursday, September 11, 2014 6:53 PM To: App_rpt-users@ohnosec.org Subject: [App_rpt-users] What is Dahdi? OK, not being a wise-ass, not trying to be stupid, that part's covered. Just trying to understand. What are the specific functions of: Dahdi - Asterisk & hardware device interface Asterisk - telephony switching and PBX service Libpri - protocols used by Asterisk/Dahdi? Zaptel - interface functionally similar to, and predating Dahdi? I know they are all part of the whole package, and that whole package still has me in awe. But being very curious type I wanted to know how this all comes together. In my simple mind I axe: why isn't Asterisk enough? I know what that one is, but as I use app_rpt daily I wish I knew which of the above are providing what part of the overall system. George J Csahanin W2DB Allstar 2360 Echolink-Free Cedar Park, TX 512-401-2630 home 401-338-0568 cel