There are certain situation issues which can arise when interoperating signaling capabilities between the gateway and Telco, one common problem is no Ringback tone.
Configuring progress_ind should only be configured when necessary. Please review the following link, it describes in detail issues such as the no ringback tone on PSTN calls, and how to troubleshoot and resolve it using the progress_ind command.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...