We have setup asterisk 1.x and currently have approx. 20 sip polycom phones on our network. This is all setup within a firewall. all outside calls are made through pstn lines that are connected with a tdm400 card.
I have been tasked to setup sip based softphones outside of the network so we can save money on international calls. We would like to be able call these softphones from within the office and also have the soft phones call into the office using the internet. here’s a quick overview of the configuration
polycom sip phones<=>asterisk<=>nat<=>internet<=>nat<=>sip based softphone
I was wondering what will be necessary to accomplish this. It seems doable but from what I read trying to connect through Nat/firewalls is going to be a problem.