Kamailio RTP Proxy Questions

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Austin Einter

7 Oct 2011 7 Oct '11

5:46 a.m.

Hi I downloaded 3.1.5 Kamalio source, did make and install. Tried to run, and tested few basic scenarios, everything working fine. I have a main proxy, want to use kamailio as intermediate proxy and my requirement is all RTP packets should pass through machine in which Kamalio proxy is running. I beleive RTP Proxy I can run in same machine where Kamailio proxy is running with proper configuration . For this I am referring, http://nil.uniza.sk/sip/nat-fw/configuring-nat-traversal-using-kamailio-31-… page. In one of the steps it says "So, if we are using the Rtpproxy server with default configuration, we have to open /etc/default/rtpproxy file and uncomment following line regarding of udp socket, that will be sued for interconnection:". I tried to search rtpproxy configuration file, could not locate. While making and installing Kamalio proxy, the commands I used "make prefix=/usr/local/ all and make prefix=/usr/local/ install". Can somebody point me why rtpproxy config file is missing. Also the link I am refering to is correct or wrong one. Best Regards, Austin

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Carsten Bock

7 Oct 7 Oct

12:35 p.m.

...

Austin Einter

1:08 p.m.

Dear Carsten Thanks for reply. I did not install rtp proxy . I just installed kamailio after that I was able to run both kamailio and rtp proxy. I am surprised, I thought after installing kamailio 3.1.5, I will be able to execute both kamailio and rtpproxy. Not sure it it was installed in my lab pc by somebody else previously. First of all I would like to check if the scenario I am talking of is a right case to use Kamalio or not. 1. I will be running the sip softphones in private/public network. 2. I want to run kamailio proxy in public network (as an intermediate proxy). 3. I will hav a main proxy in public detwork. What I want is all my signalling and RTP packets should pass through intermediate proxy (that is Kamailio only). For this purpose do you suggest Kamailio or someother proxy/b2bua. I am able to force SIP packets through kamailio proxy (by use of route stuff in softphone). My main concern is when INVITE message pass through Kamailio, will Kamailio proxy change the IP address of phone present in SDP to self address so that media packets from called party side will come to kamailio proxy. Same concern otherway. Like when 200 OK to INVITE passes through kamailio, will kamailio change IPaddress in SDP to self IP, so that media packets from calling side will reach kamailio. Kindly help me to choose right proxy or should I look for b2bua. Thanks Austin On Fri, Oct 7, 2011 at 3:05 PM, Carsten Bock <carsten(a)ng-voice.com> wrote:

...

-- Carsten Bock CEO (Geschäftsführer) ng-voice GmbH i. Gr. Schomburgstr. 80 D-22767 Hamburg / Germany http://www.ng-voice.com mailto:carsten@ng-voice.com Mobile +49 179 2021244 Office +49 40 34927219 Fax +49 40 34927220 Hier finden Sie unsere handelsrechtlichen Pflichtangaben: http://www.ng-voice.com/imprint/ _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

Carsten Bock

3:09 p.m.

Hi, you can simply use Kamailio and RTPProxy here. You simply can use rtpproxy_manage() in the request and in the reply; rtpproxy_destroy() in the Bye-Message. You must also use record_route() in order to have all subsequent requests going through your proxy. That should do your job. May you want also to look at SEMS (iptel.org/sems) as an SBC. SEMS can do that as well, but additionally also teardown in case of RTP-Timeout, Codec Enforcement (e.g. only allow G711) and of course topology hiding. Kind regards, Carsten 2011/10/7 Austin Einter <austin.einter(a)gmail.com>

...

_______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

Austin Einter

3:38 p.m.

Carsten Really appreciate your input. I am completely new to this. Please bear with me with easy questions. When you say I can use rtpproxy_manage() in the request and response and use rtpproxy_destroy() in BYE, I want to know where I have to modify. Is it kamailio.cfg file where I need to modify. If it is the case, do I need to modify the route block as below..., kindly guide me here with steps... # Main SIP request routing logic # - processing of any incoming SIP request starts with this route route { # per request initial checks route(REQINIT); # NAT detection route(NAT); ....................... Also, we are just telling rtpproxy_destroy in BYE case, will it not affect other calls. At any given point of time, there might be more than 1 calls, doing rtpproxy_destroy will stop rtp session for disconnecting call or can it affect the existing active calls. Thanks Austin. On Fri, Oct 7, 2011 at 5:39 PM, Carsten Bock <carsten(a)ng-voice.com> wrote:

...

Dear Carsten Thanks for reply. I did not install rtp proxy . I just installed kamailio after that I was

able to run both kamailio and rtp proxy.

I am surprised, I thought after installing kamailio 3.1.5, I will be able

to execute both kamailio and rtpproxy.

Not sure it it was installed in my lab pc by somebody else previously. First of all I would like to check if the scenario I am talking of is a

right case to use Kamalio or not.

1. I will be running the sip softphones in private/public network. 2. I want to run kamailio proxy in public network (as an intermediate

proxy).

3. I will hav a main proxy in public detwork. What I want is all my signalling and RTP packets should pass through

intermediate proxy (that is Kamailio only).

For this purpose do you suggest Kamailio or someother proxy/b2bua. I am able to force SIP packets through kamailio proxy (by use of route

stuff in softphone).

My main concern is when INVITE message pass through Kamailio,

will Kamailio proxy change the IP address of phone present in SDP to self address so that media packets from called party side will come to kamailio proxy.

Same concern otherway. Like when 200 OK to INVITE passes through

kamailio, will kamailio change IPaddress in SDP to self IP, so that media packets from calling side will reach kamailio.

Kindly help me to choose right proxy or should I look for b2bua. Thanks Austin On Fri, Oct 7, 2011 at 3:05 PM, Carsten Bock <carsten(a)ng-voice.com>

wrote:

> > Hi, > did you also install the RTPProxy itself? It is an addon to Kamailio and

not a part of Kamailio.

> You find the RTPProxy here: www.rtpproxy.org > Carsten > > 2011/10/7 Austin Einter <austin.einter(a)gmail.com> >> >> Hi >> I downloaded 3.1.5 Kamalio source, did make and install. Tried to run,

and tested few basic scenarios, everything working fine.

>> >> I have a main proxy, want to use kamailio as intermediate proxy and my

requirement is all RTP packets should pass through machine in which Kamalio proxy is running. I beleive RTP Proxy I can run in same machine where Kamailio proxy is running with proper configuration .

>> >> For this I am referring,

http://nil.uniza.sk/sip/nat-fw/configuring-nat-traversal-using-kamailio-31-… page.

>> >> In one of the steps it says "So, if we are using the Rtpproxy server

with default configuration, we have to open /etc/default/rtpproxy file and uncomment following line regarding of udp socket, that will be sued for interconnection:".

>> >> I tried to search rtpproxy configuration file, could not locate. >> While making and installing Kamalio proxy, the commands I used "make

prefix=/usr/local/ all and make prefix=/usr/local/ install".

Can somebody point me why rtpproxy config file is missing. Also the link I am refering to is correct or wrong one. Best Regards, Austin _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

Carsten Bock

4:21 p.m.

Hi Austin, you could simply add dlg_manage() for INVITE's directly after your "route(REQINIT)" request + a similar check in the "onreply_route". If you use rtpproxy_destroy() it will only destroy the current RTP-Session, not all of them. Kind regards, Carsten 2011/10/7 Austin Einter <austin.einter(a)gmail.com>om>:

...

Hi, did you also install the RTPProxy itself? It is an addon to Kamailio and not a part of Kamailio. You find the RTPProxy here: www.rtpproxy.org Carsten 2011/10/7 Austin Einter <austin.einter(a)gmail.com> > > Hi > I downloaded 3.1.5 Kamalio source, did make and install. Tried to run, > and tested few basic scenarios, everything working fine. > > I have a main proxy, want to use kamailio as intermediate proxy and my > requirement is all RTP packets should pass through machine in which Kamalio > proxy is running. I beleive RTP Proxy I can run in same machine where > Kamailio proxy is running with proper configuration . > > For this I am referring, > http://nil.uniza.sk/sip/nat-fw/configuring-nat-traversal-using-kamailio-31-… page. > > In one of the steps it says "So, if we are using the Rtpproxy server > with default configuration, we have to open /etc/default/rtpproxy file and > uncomment following line regarding of udp socket, that will be sued for > interconnection:". > > I tried to search rtpproxy configuration file, could not locate. > While making and installing Kamalio proxy, the commands I used "make > prefix=/usr/local/ all and make prefix=/usr/local/ install". > Can somebody point me why rtpproxy config file is missing. > > Also the link I am refering to is correct or wrong one. > > Best Regards, > Austin > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing > list > sr-users(a)lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > -- Carsten Bock CEO (Geschäftsführer) ng-voice GmbH i. Gr. Schomburgstr. 80 D-22767 Hamburg / Germany http://www.ng-voice.com mailto:carsten@ng-voice.com Mobile +49 179 2021244 Office +49 40 34927219 Fax +49 40 34927220 Hier finden Sie unsere handelsrechtlichen Pflichtangaben: http://www.ng-voice.com/imprint/ _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

Austin Einter

5:32 p.m.

Hi Carsten Many thanks to you. Now I am able to run kamailio and rtp proxy properly. Thanks Austin On Fri, Oct 7, 2011 at 6:51 PM, Carsten Bock <carsten(a)ng-voice.com> wrote:

...

Carsten Really appreciate your input. I am completely new to this. Please bear with me with easy questions. When you say I can use rtpproxy_manage() in the request and response and

use

rtpproxy_destroy() in BYE, I want to know where I have to modify. Is it kamailio.cfg file where I need to modify. If it is the case, do I need to modify the route block as below..., kindly guide me here with steps... # Main SIP request routing logic # - processing of any incoming SIP request starts with this route route { # per request initial checks route(REQINIT); # NAT detection route(NAT); ....................... Also, we are just telling rtpproxy_destroy in BYE case, will it not

affect

other calls. At any given point of time, there might be more than 1

calls,

doing rtpproxy_destroy will stop rtp session for disconnecting call or

can

it affect the existing active calls. Thanks Austin. On Fri, Oct 7, 2011 at 5:39 PM, Carsten Bock <carsten(a)ng-voice.com>

wrote:

> > Hi, > you can simply use Kamailio and RTPProxy here. > You simply can use rtpproxy_manage() in the request and in the reply; > rtpproxy_destroy() in the Bye-Message. You must also use > record_route() in order to have all subsequent requests going through > your proxy. That should do your job. > > May you want also to look at SEMS (iptel.org/sems) as an SBC. SEMS can > do that as well, but additionally also teardown in case of > RTP-Timeout, Codec Enforcement (e.g. only allow G711) and of course > topology hiding. > > Kind regards, > Carsten > > 2011/10/7 Austin Einter <austin.einter(a)gmail.com> > > > > Dear Carsten > > Thanks for reply. > > > > I did not install rtp proxy . I just installed kamailio after that I > > was able to run both kamailio and rtp proxy. > > I am surprised, I thought after installing kamailio 3.1.5, I will be > > able to execute both kamailio and rtpproxy. > > Not sure it it was installed in my lab pc by somebody else previously. > > > > First of all I would like to check if the scenario I am talking of is

> > right case to use Kamalio or not. > > > > 1. I will be running the sip softphones in private/public network. > > > > 2. I want to run kamailio proxy in public network (as an intermediate > > proxy). > > > > 3. I will hav a main proxy in public detwork. > > > > What I want is all my signalling and RTP packets should pass through > > intermediate proxy (that is Kamailio only). > > > > For this purpose do you suggest Kamailio or someother proxy/b2bua. > > I am able to force SIP packets through kamailio proxy (by use of route > > stuff in softphone). > > > > My main concern is when INVITE message pass through Kamailio, > > will Kamailio proxy change the IP address of phone present in SDP to

self

> > address so that media packets from called party side will come to

kamailio

> > proxy. > > > > Same concern otherway. Like when 200 OK to INVITE passes through > > kamailio, will kamailio change IPaddress in SDP to self IP, so that

media

> > packets from calling side will reach kamailio. > > > > Kindly help me to choose right proxy or should I look for b2bua. > > > > Thanks > > Austin > > > > > > > > On Fri, Oct 7, 2011 at 3:05 PM, Carsten Bock <carsten(a)ng-voice.com> > > wrote: > >> > >> Hi, > >> did you also install the RTPProxy itself? It is an addon to Kamailio > >> and not a part of Kamailio. > >> You find the RTPProxy here: www.rtpproxy.org > >> Carsten > >> > >> 2011/10/7 Austin Einter <austin.einter(a)gmail.com> > >>> > >>> Hi > >>> I downloaded 3.1.5 Kamalio source, did make and install. Tried to

run,

> >>> and tested few basic scenarios, everything working fine. > >>> > >>> I have a main proxy, want to use kamailio as intermediate proxy and

> >>> requirement is all RTP packets should pass through machine in which

Kamalio

> >>> proxy is running. I beleive RTP Proxy I can run in same machine

where

> >>> Kamailio proxy is running with proper configuration . > >>> > >>> For this I am referring, > >>>

http://nil.uniza.sk/sip/nat-fw/configuring-nat-traversal-using-kamailio-31-… page.

> >>> > >>> In one of the steps it says "So, if we are using the Rtpproxy server > >>> with default configuration, we have to open /etc/default/rtpproxy

file and

> >>> uncomment following line regarding of udp socket, that will be sued

for

> >>> interconnection:". > >>> > >>> I tried to search rtpproxy configuration file, could not locate. > >>> While making and installing Kamalio proxy, the commands I used "make > >>> prefix=/usr/local/ all and make prefix=/usr/local/ install". > >>> Can somebody point me why rtpproxy config file is missing. > >>> > >>> Also the link I am refering to is correct or wrong one. > >>> > >>> Best Regards, > >>> Austin > >>> _______________________________________________ > >>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing > >>> list > >>> sr-users(a)lists.sip-router.org > >>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > >>> > >> > >> > >> > >> -- > >> Carsten Bock > >> CEO (Geschäftsführer) > >> ng-voice GmbH i. Gr. > >> Schomburgstr. 80 > >> D-22767 Hamburg / Germany > >> http://www.ng-voice.com > >> mailto:carsten@ng-voice.com > >> Mobile +49 179 2021244 > >> Office +49 40 34927219 > >> Fax +49 40 34927220 > >> Hier finden Sie unsere handelsrechtlichen Pflichtangaben: > >> http://www.ng-voice.com/imprint/ > >> > >> _______________________________________________ > >> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing

list

> >> sr-users(a)lists.sip-router.org > >> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > >> > > > > > > _______________________________________________ > > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing

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Austin Einter
Carsten Bock