[SR-Users] kamailio & rtpengine question

Fri Oct 14 13:37:04 CEST 2022

Hello,

there is no inherent problem regarding SDP handling when Kamailio, rtpengine and e.g., Asterisk are on the same subnet. We are running it in some setup on an single machine.

Cheers,

Henning

--
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com<https://gilawa.com/>

From: Gerry Kernan <gerry at infinityit.ie>
Sent: Friday, October 14, 2022 1:23 PM
To: Henning Westerholt <hw at gilawa.com>; Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: RE: [SR-Users] kamailio & rtpengine question

Hi Henning

Issue could be that I’m trying to do something that’s not possible .
We have an asterisk server behind kamailio .  kamailio and asterisk are on the same subnet 10.3.1.0/24 . kamailo/rtpeengine are configured to advertise its WAN IP . would this mess up SIP/RTP from kamailio to the asterisk server.

Best Regards

Gerry

From: Henning Westerholt <hw at gilawa.com<mailto:hw at gilawa.com>>
Sent: Tuesday 11 October 2022 07:28
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org<mailto:sr-users at lists.kamailio.org>>
Cc: Gerry Kernan <gerry at infinityit.ie<mailto:gerry at infinityit.ie>>
Subject: RE: [SR-Users] kamailio & rtpengine question

Hello,

from the module readme:

„trust-address - flags that IP address in SDP should be trusted. Starting with rtpengine 3.8, this is the default behaviour. In older versions, without this flag the RTP proxy ignores the address in the SDP and uses source address of the SIP message as media address which is passed to the RTP proxy”

You probably want to change this to SIP-source-address. Refer e.g. to the kamailio default cfg.

Cheers,

Henning

--
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com<https://gilawa.com/>

From: sr-users <sr-users-bounces at lists.kamailio.org<mailto:sr-users-bounces at lists.kamailio.org>> On Behalf Of Gerry Kernan
Sent: Monday, October 10, 2022 2:58 PM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org<mailto:sr-users at lists.kamailio.org>>
Subject: Re: [SR-Users] kamailio & rtpengine question

Hi
Im using rtpengine_offer as below
rtpengine_offer("trust-address replace-origin replace-session-connection ICE=remove")
is there another flag I need to set to change c=in to the WAN alias?

rtpeengine.conf
interface as set as below
### for different advertised address:
interface = 10.3.1.6!20.82.X.X

But the SDP send to client c=IN  contains the private IP of the kamailio server

v=0
o=root 321199167 321199167 IN IP4 10.3.1.5
s=Asterisk PBX 18.12.1
c=IN IP4 10.3.1.6
t=0 0
m=audio 32080 RTP/AVP 0 8 103
a=maxptime:150
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:103 telephone-event/8000
a=fmtp:103 0-16
a=sendrecv
a=rtcp:32081
a=ptime:20
m=video 0 RTP/AVP 34

Best Regards

Gerry

From: Gerry Kernan
Sent: Saturday 8 October 2022 11:21
To: Henning Westerholt <hw at gilawa.com<mailto:hw at gilawa.com>>; Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org<mailto:sr-users at lists.kamailio.org>>
Subject: RE: [SR-Users] kamailio & rtpengine question

Ive tried setting below in rtpengine.conf , but i get the same behaviour
 interface=10.3.1.6!XX.XX.XX.XX

Best Regards

Gerry

From: Henning Westerholt <hw at gilawa.com<mailto:hw at gilawa.com>>
Sent: Saturday 8 October 2022 08:32
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org<mailto:sr-users at lists.kamailio.org>>
Cc: Gerry Kernan <gerry at infinityit.ie<mailto:gerry at infinityit.ie>>
Subject: RE: [SR-Users] kamailio & rtpengine question

Hello,

you might need to set the advertised address for rtpengine as well:
https://github.com/sipwise/rtpengine/blob/master/etc/rtpengine.conf

Cheers,

Henning

--
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com<https://gilawa.com/>

From: sr-users <sr-users-bounces at lists.kamailio.org<mailto:sr-users-bounces at lists.kamailio.org>> On Behalf Of Gerry Kernan
Sent: Friday, October 7, 2022 10:49 AM
To: sr-users at lists.kamailio.org<mailto:sr-users at lists.kamailio.org>
Subject: [SR-Users] kamailio & rtpengine question

Hi
Looking for advise if anyone could point out where im going wrong.
My setup is Kamailio Ver  5.6.0  running in azure , rtpengine Version: git-master-dc395d5, behind kamailio I have asterisk ver 18.12.1

Kamailio conf I have interface set as below
listen=udp:10.3.1.6:5060 advertise WANIP:5060

and rtpengine.conf set as below
interface = eth0/10.3.1.5

but when I can make a call I don’t get any audio, rtpengine.log extract below shows that rtp is going to the private IP rather that the Public IP of the phone that initiated the call, do I need to set rtpengine_manage() to fix this?

Oct  7 09:38:58 kamailio-proxy rtpengine[8127]: INFO: [NmE0MjdhMzA4NjUzYWVjMmRjYzIxNGJjMTY4ZTc2MWE. port 30278]: [core] Confirmed peer address as 10.3.1.5:12890
Oct  7 09:38:58 kamailio-proxy rtpengine[8127]: INFO: [NmE0MjdhMzA4NjUzYWVjMmRjYzIxNGJjMTY4ZTc2MWE. port 30278]: [core] Kernelizing media stream: 10.3.1.5:12890 -> 10.3.1.6:30278 | 10.3.1.6:30298 -> 192.168.0.123:40042
Oct  7 09:39:00 kamailio-proxy rtpengine[8127]: INFO: [NmE0MjdhMzA4NjUzYWVjMmRjYzIxNGJjMTY4ZTc2MWE. port 30279]: [core] Confirmed peer address as 10.3.1.5:12891

Kind regards

gerry

Gerry Kernan  |  Technical Director

Mobile: +353(0)86-170 9790

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