diff --git a/owrx/service/__init__.py b/owrx/service/__init__.py
index 9c20f5de..d78b03e3 100644
--- a/owrx/service/__init__.py
+++ b/owrx/service/__init__.py
@@ -321,6 +321,12 @@ class ServiceHandler(SdrSourceEventClient):
         elif mod == "vdl2":
             from csdr.chain.dumpvdl2 import DumpVDL2
             return DumpVDL2()
+        elif mod == "pocsag":
+            from csdr.chain.digiham import PocsagDemodulator
+            return PocsagDemodulator()
+        elif mod == "ism":
+            from csdr.chain.rtl433 import Rtl433
+            return Rtl433()
 
         raise ValueError("unsupported service modulation: {}".format(mod))