We have A2Billing 1.4.2 (current version).
We are having a hard time getting the callback function working on Ubuntu. Switch is Asterisk - not Trixbox, FreePBX or Elastix. Simply Asterisk and A2Billing installed on top of it.
The callback daemon is running, but the configuration is baffling.
Need someone who has done A2Billing callback before in a 1.4 version to come in, setup an inbound route, make sure callback occurs and make sure that both legs are billed.
Should take someone who knows the callback system less than 30 minutes.