* #29158: sip: don't use received port if received port is 0

daemon/src/sip/sipaccount.cpp

@@ -1108,7 +1108,7 @@ std::string SIPAccount::getContactHeader() const
         DEBUG("Using received address %s", address.c_str());
     }
 
-    if (rPort_ != -1) {
+    if (rPort_ != -1 and rPort_ != 0) {
         portstr << rPort_;
         port = portstr.str();
         DEBUG("Using received port %s", port.c_str());