[Freeswitch-users] Binding to external IP address during system boot

I am running FreeSWITCH under Debian, with ppp0 (an ADSL connection) as the external interface. Often, FreeSWITCH successfully starts and binds to the (dynamically assigned) external IPv4 address during the system boot process. Sometimes, however, this fails and I get (from sofia status profile external): sip:mod_sofia@127.0.0.1:5080 Clearly, it has bound to the loopback interface. Restarting the sip profile doesn't fix it, but restarting FreeSWITCH does. Is there a command that I can place in a networking script that will force the binding to be dropped and a new binding to be created, without restarting FreeSWITCH entirely?