Hello, We installed and configured Freeswitch on CentOS as per the steps provided in below link, https://freeswitch.org/confluence/display/FREESWITCH/CentOS+7+and+RHEL+7#Cen... This is the status - * Users are getting registered * When User A calls User B, B gets a ringtone and is able to answer the call * A sees that the call is connected but there is no audio for either A or B. netstat output --------------------- tcp 0 0 <SVR_IP>:5060 0.0.0.0:* LISTEN 10503/freeswitch tcp 0 0 <SVR_IP>:8081 0.0.0.0:* LISTEN 10503/freeswitch tcp 0 0 <SVR_IP>:8082 0.0.0.0:* LISTEN 10503/freeswitch tcp 0 0 0.0.0.0:8021 0.0.0.0:* LISTEN 10503/freeswitch tcp 0 0 <SVR_IP>:5080 0.0.0.0:* LISTEN 10503/freeswitch Log output --------------- 2020-10-21 08:32:12.323087 [NOTICE] switch_ivr_originate.c:3794 Channel [sofia/internal/1001@<SVR_IP>] has been answered 2020-10-21 08:32:12.323087 [DEBUG] switch_channel.c:3865 (sofia/internal/1001@<SVR_IP>) Callstate Change EARLY -> ACTIVE 2020-10-21 08:32:12.323087 [DEBUG] sofia.c:7326 Channel sofia/internal/1001@<SVR_IP> entering state [completed][200] 2020-10-21 08:32:12.323087 [DEBUG] switch_ivr_originate.c:3852 Originate Resulted in Success: [sofia/internal/1000@192.168.43.32:18486] 2020-10-21 08:32:12.323087 [DEBUG] switch_ivr_originate.c:3852 Originate Resulted in Success: [sofia/internal/1000@192.168.43.32:18486] 2020-10-21 08:32:12.323087 [DEBUG] switch_ivr_bridge.c:1793 (sofia/internal/1000@192.168.43.32:18486) State Change CS_CONSUME_MEDIA -> CS_EXCHANGE_MEDIA 2020-10-21 08:32:12.323087 [DEBUG] switch_core_state_machine.c:585 (sofia/internal/1000@192.168.43.32:18486) Running State Change CS_EXCHANGE_MEDIA (Cur 2 Tot 6) 2020-10-21 08:32:12.323087 [DEBUG] switch_core_state_machine.c:654 (sofia/internal/1000@192.168.43.32:18486) State EXCHANGE_MEDIA 2020-10-21 08:32:12.323087 [DEBUG] mod_sofia.c:656 SOFIA EXCHANGE_MEDIA 2020-10-21 08:32:12.723235 [DEBUG] sofia.c:7326 Channel sofia/internal/1001@<SVR_IP> entering state [ready][200] 2020-10-21 08:32:16.123236 [DEBUG] switch_rtp.c:2448 RTCP packet not written 2020-10-21 08:32:20.143147 [DEBUG] switch_rtp.c:2448 RTCP packet not written 2020-10-21 08:32:24.163187 [DEBUG] switch_rtp.c:2448 RTCP packet not written This keeps repeating - "RTCP packet not written" Please let us know what we might be doing wrong. Appreciate your help. Regards, Krishnan