Hello, just trying to understsand SIP operation.
I have a Cisco wag120n adsl modem. I am setup with a SIP provider, so all my incoming and outgoing calls use SIP.
So my question is, how does my ADSL modem handle incoming SIP calls
e.g the SIP call comes in and reaches my adsl modem. Then, how does the modem find the actual port that has my ATA adaptor (analog phone) or CME router attached ? I know port forwarding would handle this, but I am not actually using any configured port forwarding rules.
Thanks for any enlightenment.
