I have an asterisk box running behind a NAT firewall on my ADSL.
I have 3 extentions running internally and 2 iphones using 3g and iSIP that connect externally to the asterisk server. I can call from iphone to iphone but it is really laggy and is not really clear or working.
When I try to call out to the PSTN the called party gets choppy audio/hangup after 20 or so seconds. Is there anything I can look at to optimise this?