From what I’ve read about Asterisk it can be connected to a Telstra ISDN 10, 20 or 30 connection to enable VOIP to POTS communication, is that correct?
If so, could the following scenario work:
You have a main office that has a Telstra ISDN 10, 20 or 30 connection connected to your Asterisk PBX. All the internal users use VOIP for internal calls and use the ISDN to allow internal calls to communicate with POTS phones on the outside and outside POTS phones to communicate with the internal VOIP phones.
You have a remote branch office (10 - 15 employees) connected through an ADSL VPN to your head office. The question is, could those remote users utilise the services of the Asterisk PBX over their VPN connection to the head office without having a local Asterisk PBX configured at the remote office? In other words, they could call a POTS number and the information would transmitted over the VPN to the Asterisk PBX located at head office and routed through the ISDN connection to the outside POTS number.
Any help with the above would be greatly appreciated.