Warning: Virginal Post! Hi All I have asterisk 1.2.4 dmz'd behind an ADSL broadband router with an IP address that can change up to several times a day (courtesy Telkom SA). If I manually plug the current IP into "externip" in sip.conf, SIP audio is fine. If I try to use "externhost" & "externrefresh" instead, the box doesn't seem to keep up and I end up with one way audio. What am I not aware of?? Kind regards Tim