No RTP traffic, ports enabled, no sound

[Slovnaaak (Slovanaak)]

Hello, I am having issue with both external and internal calls not having any audio, most likely due to me not receiving any RTP traffic (I checked using rtp set debug on ). I am using ufw so naturally I have enabled ports in range 10000-20000/udp as can be seen on this output:

root@mainasteriskenv:~# sudo ufw status 
Status: active

To                         Action      From
--                         ------      ----
5060/tcp                   ALLOW       Anywhere                  
22/tcp                     ALLOW       Anywhere                  
5060                       ALLOW       Anywhere                  
5061                       ALLOW       Anywhere                  
5061/udp                   ALLOW       Anywhere                  
5060/udp                   ALLOW       Anywhere                  
4000:5000/udp              ALLOW       Anywhere                  
4000:5000/tcp              ALLOW       Anywhere                  
10000:20000/udp            ALLOW       Anywhere                  
53/udp                     ALLOW       Anywhere                  
53/tcp                     ALLOW       Anywhere                  
123/udp                    ALLOW       Anywhere                  
5060:5061/udp              ALLOW       Anywhere                  
5060/tcp (v6)              ALLOW       Anywhere (v6)             
22/tcp (v6)                ALLOW       Anywhere (v6)             
5060 (v6)                  ALLOW       Anywhere (v6)             
5061 (v6)                  ALLOW       Anywhere (v6)             
5061/udp (v6)              ALLOW       Anywhere (v6)             
5060/udp (v6)              ALLOW       Anywhere (v6)             
4000:5000/udp (v6)         ALLOW       Anywhere (v6)             
4000:5000/tcp (v6)         ALLOW       Anywhere (v6)             
10000:20000/udp (v6)       ALLOW       Anywhere (v6)             
53/udp (v6)                ALLOW       Anywhere (v6)             
53/tcp (v6)                ALLOW       Anywhere (v6)             
123/udp (v6)               ALLOW       Anywhere (v6)             
5060:5061/udp (v6)         ALLOW       Anywhere (v6)             

root@mainasteriskenv:~#

this range corresponds to rtp.conf

Note that I am using fail2ban as well, though that should have zero impact on anything. But I feel like I should mention it…

Thank you to anyone who contributes here

[comtech]

@Slovnaaak

most likely due to me not receiving any RTP traffic

This is the answer. The you’ll need to trace a call to see where the packets are dropping, some firewall in the chain, likely. It’s just wild guesses otherwise.

[dicko]

You need to both accept the traffic but also forward it to the PBX on your point of ingress router if the PBX is NAT’ed

[Slovnaaak (Slovanaak)]

tried capturing the traffic on UDP 1000-20000 and all SIP ports. It’s apparent that some RTP traffic is being transmitted but no audio streams are available, hence the error.

Anything I could do?