Good day all
I hope Im on the right place to ask the question.
Im a newbie to kamailio and have a little problem understanding how to set kamailio correctly.
Scenario:
VoIP Supplier (IP:161.161.252.20{Private Net}) à Connect via routing to Kamailio Server(155.155.16.2 eno2{private Net}),Kamailio Server(187.221.197.252 eno1{public facing})àconnect to PBX(public IP set in dispatcher) à connect to RTP server(Public IP)
Now the problem is that if you call in Number@161.161.252.20 mailto:Number@161.161.252.20 is send to kamailio, kamailio then sends it down to dispatcher IP and that PBX responds directly back via rtp server to 161.161.252.20. The 161.161.252.20 IP is private and cannot be reached from the cloud and vice versa . How do I get kamailio to be the middle man between 161.161.252.20 and RTP server(all traffic must go via the kamailio server) Is there specific modules I must load.
Im running Kamailio 4.4
Any help would be muchly appreciated.
Regards
Pieter
On Thu, Sep 27, 2018 at 10:03:24AM +0200, Pieter Muller wrote:
VoIP Supplier (IP:161.161.252.20{Private Net}) ? Connect via routing to Kamailio Server(155.155.16.2 eno2{private Net}),Kamailio Server(187.221.197.252 eno1{public facing})?connect to PBX(public IP set in dispatcher) ? connect to RTP server(Public IP)
Now the problem is that if you call in Number@161.161.252.20 mailto:Number@161.161.252.20 is send to kamailio, kamailio then sends it down to dispatcher IP and that PBX responds directly back via rtp server to 161.161.252.20. The 161.161.252.20 IP is private and cannot be reached from the cloud and vice versa . How do I get kamailio to be the middle man between 161.161.252.20 and RTP server(all traffic must go via the kamailio server) Is there specific modules I must load.
You need to use an RTP proxy to achieve this. So yes you need to load extra modules and configure kamailio for this proxying. If you take a look at https://github.com/kamailio/kamailio/blob/master/etc/kamailio.cfg and search for rtpproxy. The really really short explanation: you need to call rtpproxy_manage for calls that you want to rewrite rtp for.
Thank you Daniel, I'm currently looking into your suggestion. If I insert my public IP under: # - start RTPProxy: # rtpproxy -l _your_public_ip_ -s udp:localhost:7722 # - option for NAT SIP OPTIONS keepalives: WITH_NATSIPPING
Must I also modify UDP part below:
#!ifdef WITH_NAT # ----- rtpproxy params ----- modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:7722")
or can I leave it as is. I have 1 NIC running private to VSP and 1NIC Public facing...So my mind is telling me to keep it as 127.0.0.1???
Regards Pieter
-----Original Message----- From: sr-users sr-users-bounces@lists.kamailio.org On Behalf Of Daniel Tryba Sent: Thursday, 27 September 2018 10:59 AM To: Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Subject: Re: [SR-Users] kamailio rtp connection
On Thu, Sep 27, 2018 at 10:03:24AM +0200, Pieter Muller wrote:
VoIP Supplier (IP:161.161.252.20{Private Net}) ? Connect via routing to Kamailio Server(155.155.16.2 eno2{private Net}),Kamailio Server(187.221.197.252 eno1{public facing})?connect to PBX(public IP set in dispatcher) ? connect to RTP server(Public IP)
Now the problem is that if you call in Number@161.161.252.20 mailto:Number@161.161.252.20 is send to kamailio, kamailio then sends it down to dispatcher IP and that PBX responds directly back via rtp server to 161.161.252.20. The 161.161.252.20 IP is private and cannot be reached from the cloud and vice versa . How do I get kamailio to be the middle man between 161.161.252.20 and RTP server(all traffic must go via the kamailio server) Is there specific modules I must load.
You need to use an RTP proxy to achieve this. So yes you need to load extra modules and configure kamailio for this proxying. If you take a look at https://github.com/kamailio/kamailio/blob/master/etc/kamailio.cfg and search for rtpproxy. The really really short explanation: you need to call rtpproxy_manage for calls that you want to rewrite rtp for.
_______________________________________________ Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
On Fri, Sep 28, 2018 at 11:47:12AM +0200, Pieter Muller wrote:
If I insert my public IP under: # - start RTPProxy: # rtpproxy -l _your_public_ip_ -s udp:localhost:7722 # - option for NAT SIP OPTIONS keepalives: WITH_NATSIPPING
Must I also modify UDP part below:
#!ifdef WITH_NAT # ----- rtpproxy params ----- modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:7722")
or can I leave it as is. I have 1 NIC running private to VSP and 1NIC Public facing...So my mind is telling me to keep it as 127.0.0.1???
127.0.0.1 (on port 7722) is used to communicate from kamailio to rtpproxy, so you can keep that.
Never had to use rtpproxy to bridge between private and public networks, but if you check the archives of this list you should find some examples (keywords might be multi homed or bridged rtp)
-
Daniel Tryba -
Pieter Muller