[SR-Users] Rtpengine - no RTP packets going out

[Istvan Mogyorosi]

Hello

Thanks Richard, You were right.
Now the codec is recognized, and statistics show real data.
Just a quick recap what needs to be done:
- enable packet forwarding
- firewalld add service SIP and UDP port range to enable incoming traffic
- enable packet flow between external / internal interfaces using 
FORWARD and POSTROUTING direct rules
- setup masquerading for the internal network

Cheers,
Istvan

Richard Fuchs a écrit le 01/04/2019 à 20:02 :
> On 01/04/2019 09.14, Istvan Mogyorosi wrote:
>> Dear all,
>>
>> This is my first post after reading a lot in this mailing-list.
>> I'm trying to use Kamailio 5.1 with the dispatcher module and 
>> rtpengine acting as SIP + RTP proxy.
>> I have 6 asterisk servers in a private subnet that should talk with 
>> the peer via a single IP like this:
>>
>> Asterisk 1..n|---> | GW.PRIVATE.IP -o- GW.PUBLIC.IP |----> 
>> PEER.SIP.TRUNK
>>
>> I'm on Centos 7, with firewalld configured, iptables module is loaded 
>> and the rule is well defined.
>> Packet forwarding is also enabled.
>>
>> Chain rtpengine (1 references)
>> target     prot opt source               destination
>> RTPENGINE  udp  --  anywhere             anywhere RTPENGINE id:40
>>
>> My call flow seems to be fine, Kamailio/rtpengine private IP is the 
>> outboundproxy parameter of Asterisk instances.
>>
>> My problem is that RTP packets are not present on the public 
>> interface, the rtpengine final log showing
>> the 2 sessions, but I'm not sure this is what I want or simply the 
>> firewall does not let it out ?
>> (To be more precise PEER.SIP.TRUNK is the trunk for SIP traffic, I 
>> have multiple IP addresses
>> for media to connect to, reinvites are allowed)
>>
>> Closing call due to timeout
>> Final packet stats:
>> --- Tag 'as6d12caea', created 1:00 ago for branch '', in dialogue 
>> with 'as541b1e61'
>> ------ Media #1 (audio over RTP/AVP) using unknown codec
>> --------- Port  GW.PRIVATE.IP:10000 <> 192.168.30.13:11152, SSRC 0, 0 
>> p, 0 b, 0 e, 60 ts
>> --------- Port  GW.PRIVATE.IP:10001 <>   192.168.30.13:11153 (RTCP), 
>> SSRC 0, 0 p, 0 b, 0 e, 60 ts
>>
>> --- Tag 'as541b1e61', created 1:00 ago for branch '', in dialogue 
>> with 'as6d12caea'
>> ------ Media #1 (audio over RTP/AVP) using unknown codec
>> --------- Port     GW.PUBLIC.IP:10000 <> PEER.SIP.TRUNK:28216, SSRC 
>> 0, 0 p, 0 b, 0 e, 60 ts
>> --------- Port     GW.PUBLIC.IP:10001 <> PEER.SIP.TRUNK:28217 (RTCP), 
>> SSRC 0, 0 p, 0 b, 0 e, 60 ts
>>
> These are all reception counters, so this is a problem of packets not 
> being received. Having the iptables RTPENGINE rule installed does not 
> automatically allow the packets to pass through your firewall. You 
> have to do that separately.
>
> Cheers
>
>
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