If you are using **Skylink Media Relay** while only subscribing to the PeerJoined event, you will not note any '**sent stats**' for peers due to the way **Skylink Media Relay** works.

Consider the following scenario where **Skylink Media Relay** is not in use.

__Scenario A__

**No MCU/SFU**

In this case, the total number of streams uploaded will be:

( n ) x ( n-1 )

where **n** represents the total number of Peers. In this case, that would be 4 x 3 = 12.

Here, both the total peer connections and the number of streams will be 4.

Now, in the following scenario where **Skylink Media Relay** is in use, each peer sends streams directly to the MCU/SFU and not to the remote peers, as depicted below.

__Scenario B__

**With MCU/SFU**

In this case, the total number of streams uploaded will be:

( n ) x ( 1)

where **n** represents the total number of Peers passing streams through the MCU Peer. In this case, that would be 4 x 1 = 4 with the total peer connections being ('**n**' + The MCU Peer).

In this case, the total number of streams uploaded will be 5.

To retrieve sent stats from the MCU peer, you can subscribe to the ServerPeerJoined event.

**For Example:**

var mcuStatInterval = null; var mcuPeerId = null; skylink.on('serverPeerJoined', function (peerId, serverPeerType) { if (serverPeerType === 'MCU') { mcuPeerId = peerId; mcuStatInterval = setInterval(function () { skylink.getConnectionStatus(peerId, function (err, stats) { if (stats && stats.peerStats[peerId]) { console.info(stats.peerStats[peerId]) } }); }, 1000); } }); skylink.on('peerLeft', function (peerId) { if (peerId === mcuPeerId && mcuStatInterval) { clearInterval(mcuStatInterval) } });