Integrate voso, join_call route for channels.

src/database/entities/message.rs

@@ -179,7 +179,7 @@ impl Message {
                 builder.set_vapid_signature(signature);
                 builder.set_payload(ContentEncoding::AesGcm, enc.as_bytes());
                 let m = builder.build().unwrap();
-                let response = client.send(m).await.ok();
+                client.send(m).await.ok();
             }
         }