var.xml

<X-PRE-PROCESS cmd="set" data="external_sip_ip=公网IP"/>

<X-PRE-PROCESS cmd="set" data="external_rtp_ip=公网IP"/>

 

sip_profiles/external.xml  和 sip_profiles/internal.xml

<param name="ext-rtp-ip" value="$${external_rtp_ip}"/>

<param name="ext-sip-ip" value="$${external_sip_ip}"/>

<param name="aggressive-nat-detection" value="true"/>

<param name="NDLB-force-rport" value="true"/>