Update call-flows.md

Author: fizampou

articles/communication-services/concepts/call-flows.md

@@ -78,7 +78,7 @@ Signaling flows through the signaling controller. Media flows through the Media
 
 ### Case 6: Early media
 
-If there is early media flow, the SBC must latch to the first endpoint that starts streaming media; media flow can start before candidates are nominated. The SBC should have support for sending DTMF during this phase to enable IVR/voicemail scenarios. The SBC should use the highest priority path on which it has received checks if nominations have not completed.
+Refers to media (e.g., audio and video) that is exchanged   before a particular session is accepted by the called user. If there is early media flow, the SBC must latch to the first endpoint that starts streaming media; media flow can start before candidates are nominated. The SBC should have support for sending DTMF during this phase to enable IVR/voicemail scenarios. The SBC should use the highest priority path on which it has received checks if nominations have not completed.
 
 ## Next steps