--- a/media/webrtc/signaling/src/jsep/JsepSessionImpl.cpp
+++ b/media/webrtc/signaling/src/jsep/JsepSessionImpl.cpp
@@ -1394,17 +1394,21 @@ JsepSessionImpl::CreateGenericSDP(Unique
   //     version> field SHOULD be zero.  The value of the <nettype>
   //     <addrtype> <unicast-address> tuple SHOULD be set to a non-
   //     meaningful address, such as IN IP4 0.0.0.0, to prevent leaking the
   //     local address in this field.  As mentioned in [RFC4566], the
   //     entire o= line needs to be unique, but selecting a random number
   //     for <sess-id> is sufficient to accomplish this.
 
   auto origin =
-      SdpOrigin("-", mSessionId, mSessionVersion, sdp::kIPv4, "0.0.0.0");
+      SdpOrigin("mozilla...THIS_IS_SDPARTA-" MOZ_APP_UA_VERSION,
+                mSessionId,
+                mSessionVersion,
+                sdp::kIPv4,
+                "0.0.0.0");
 
   UniquePtr<Sdp> sdp = MakeUnique<SipccSdp>(origin);
 
   if (mDtlsFingerprints.empty()) {
     JSEP_SET_ERROR("Missing DTLS fingerprint");
     return NS_ERROR_FAILURE;
   }