we want to setup an Asterisk service for multiple clients with 1 SIP trunk to our ITSP/PSTN provider.
We want to put OpenSER as front end and multiple Asterisk servers to handle the load for all the clients. We have 1 SIP trunk to our ITSP/PSTN provider.
How/where do we interconnect to out PSTN/ITSP provider? On the front-end OpenSER or do we need an OpenSER on the backend only for the SIP trunk?
How good is OpenSER with NAT?