Solved No sound on outbound calls

[ca_maer]

So I have this weird issue where 9 out the 10 times the outbound call get connected but there is no sound. I ran the firewall check which returned OK for everything.

Also tried to check 'PBX Deliver Audio' but to no avail. Here's my IPtables rules on debian

Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     udp  --  anywhere             sip.mcast.net
ACCEPT     tcp  --  anywhere             anywhere             multiport dports http,https,sip,sip-tls,5090 tcp flags:FIN,SYN,RST,ACK/SYN ctstate NEW
ACCEPT     udp  --  anywhere             anywhere             multiport dports sip,5090,9000:10999

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

My firewall is pfsense and I've followed the 3cx doc for pfsense.

Any ideas ?

 

[AWS2P]

Try to remove IPv6

 

[ca_maer]

I've set the IP mode in the trunk to IPv4 and in network I've unchecked Automatically Bind to IPv6 Adapters if present and restarted the services but to no avail. Is there another place I've missed that I need to change to disable IPv6 ?

 

[JohnS_3CX]

Hi

To a specific destination? If you hang up and call the same number again will it work?

Would you be able to run a capture and make a few calls until you catch one that doesn't work?

 

[ca_maer]

Hi

To a specific destination? If you hang up and call the same number again will it work?

Would you be able to run a capture and make a few calls until you catch one that doesn't work?

Yes even if it's different numbers. According to a wireshark packet capture It seems like the RTP traffic is not coming back so I've opened a support ticket with my SIP provider. Will wait for their analysis and report back. Thanks !

 

[JohnS_3CX]

Good call, lets see how they reply.

 

[ca_maer]

Turns out it was in fact the SIP provider ! They fixed the issue on their side and everything is working fine now ! Thanks to everybody for the help !

 

[JohnS_3CX]

I'm glad to hear it was resolved, thanks for updating the thread