Hi Rolly, Hard to say without more details, but have a look to the SDP for the problematic calls, so see if everything is rewritten or inserted correctly. Cheers, Henning -- Henning Westerholt – https://skalatan.de/blog/ Kamailio services – https://gilawa.com<https://gilawa.com/> From: sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; On Behalf Of Rolly Casuga Jr. Sent: Wednesday, November 25, 2020 5:32 AM To: sr-users(a)lists.kamailio.org Subject: [SR-Users] Kamailio Failover Hi, I am having a problem on fail overing my master kamailio server and slave kamailio server. I use kamailio as a load balancer for my asterisk servers. And it is working with calls, but when I added failover with keepalived to the slave, there is no audio during calls. Thank you, Rolly