diff --git a/src/Socket/messages-recv.ts b/src/Socket/messages-recv.ts
index 7080ff7..0a8f959 100644
--- a/src/Socket/messages-recv.ts
+++ b/src/Socket/messages-recv.ts
@@ -428,6 +428,15 @@ export const makeMessagesRecvSocket = (config: SocketConfig) => {
         logger.debug({ attrs: node.attrs }, 'sending receipt for ack')
     })
 
+    ws.on('CB:call', async(node: BinaryNode) => {
+        logger.info({ node }, 'recv call')
+
+        const [child] = getAllBinaryNodeChildren(node)
+        if(child.tag === 'terminate' || child.tag === 'relaylatency') {
+            await sendMessageAck(node, { class: 'call', type: child.tag })
+        }
+    })
+
     const handleReceipt = async(node: BinaryNode) => {
         const { attrs, content } = node
         const isRead = isReadReceipt(attrs.type)
diff --git a/src/WABinary/index.ts b/src/WABinary/index.ts
index 74bc259..e9d677c 100644
--- a/src/WABinary/index.ts
+++ b/src/WABinary/index.ts
@@ -276,6 +276,13 @@ export const getBinaryNodeChildren = ({ content }: BinaryNode, childTag: string)
     return []
 }
 
+export const getAllBinaryNodeChildren = ({ content }: BinaryNode) => {
+    if(Array.isArray(content)) {
+        return content
+    }
+    return []
+}
+
 export const getBinaryNodeChild = ({ content }: BinaryNode, childTag: string) => {
     if(Array.isArray(content)) {
         return content.find(item => item.tag == childTag)