I have LAN infrastructure with asterisk and SIP phones(Gigaset A580) in it, I have done port forwarding on my public static ip address to my asterisk server in my LAN network, I also have trunk which I have rented so that phones from public PBX can call my SIP phones and that part works.
Now I want to connect my SIP phone Gigaset A580 base station that comes with handset from other LAN, over internet, to my asterisk server.
Can you tell me what I need to accomplish that? I tried several configuration but with no success.
Thank you all in advance