add inbound-zrtp-passthru to sample configs

conf/vanilla/sip_profiles/external.xml

@@ -57,6 +57,7 @@
     <param name="nonce-ttl" value="60"/>
     <param name="auth-calls" value="false"/>
     <param name="inbound-late-negotiation" value="true"/>
+    <param name="inbound-zrtp-passthru" value="true"/>
     <!--
         DO NOT USE HOSTNAMES, ONLY IP ADDRESSES IN THESE SETTINGS!
     -->

conf/vanilla/sip_profiles/internal-ipv6.xml

@@ -70,6 +70,9 @@
     <!-- Let calls hit the dialplan before selecting codec for the a-leg -->
     <param name="inbound-late-negotiation" value="true"/>
 
+    <!-- Allow ZRTP clients to negotiate end-to-end security associations -->
+    <param name="inbound-zrtp-passthru" value="true"/>
+
     <!-- this lets anything register -->
     <!--  comment the next line and uncomment one or both of the other 2 lines for call authentication -->
     <!-- <param name="accept-blind-reg" value="true"/> -->

conf/vanilla/sip_profiles/internal.xml

@@ -222,6 +222,9 @@
     <!-- Let calls hit the dialplan before selecting codec for the a-leg -->
     <param name="inbound-late-negotiation" value="true"/>
 
+    <!-- Allow ZRTP clients to negotiate end-to-end security associations -->
+    <param name="inbound-zrtp-passthru" value="true"/>
+
     <!-- this lets anything register -->
     <!--  comment the next line and uncomment one or both of the other 2 lines for call authentication -->
     <!-- <param name="accept-blind-reg" value="true"/> -->