KAZOO-1846: do not send option pings if the user-agent is for a SPA8000, it causes the ATA to reboot when multiple lines are registered

kamailio/registrar-role.cfg

@@ -51,8 +51,13 @@ route[HANDLE_REGISTER]
             force_rport();
             fix_nated_register();
         }
-        setbflag(FLB_NATB);
-        setbflag(FLB_NATSIPPING);
+
+        ## KAZOO-1846: Cisco SPA8000 freaks out on options pings
+        if (!($ua =~ "Linksys/SPA8000")) {
+            setbflag(FLB_NATB);
+            setbflag(FLB_NATSIPPING);
+        }
+
         #!endif
 
         if (is_present_hf("Authorization")) {