diff --git a/lib/plugins_command_13/pjsipDetails.js b/lib/plugins_command_13/pjsipDetails.js
index 8404d29..342b731 100644
--- a/lib/plugins_command_13/pjsipDetails.js
+++ b/lib/plugins_command_13/pjsipDetails.js
@@ -127,8 +127,10 @@ var IDLOG = '[pjsipDetails]';
               list[data.actionid].ip = (data.uri.split('@')[1]).split(':')[0];
               list[data.actionid].port = (data.uri.split('@')[1]).split(':')[1];
             }
-            // check if the IP is private otherwise get it from callid
-            if (!util.isPrivateIP(list[data.actionid].ip)){
+            // check if the IP is private otherwise get it from callid.
+            // callid is absent for statically-configured (non-registered)
+            // contacts, so guard it to avoid crashing on public-IP trunks.
+            if (data.callid && !util.isPrivateIP(list[data.actionid].ip)){
               list[data.actionid].ip = data.callid.split('@')[1];
             }
             list[data.actionid].sipuseragent = data.useragent;