Holy cow, sorry about that!

Put the hostname in dispatcher (no port or _sip._udp) and enable these:

use_dns_cache=on use_dns_failover=on dns_srv_lb=on

That's how I got it working (using the LCR module).

On Wed, Jan 25, 2017 at 1:05 PM, Jeremy Gadd jeremygadd@gmail.com wrote:

Put the hostname in dispatcher (no port) and enable these:

On Wed, Jan 25, 2017 at 9:30 AM, Casco, Alessio alessio.casco@nexmo.com wrote:

...

Hello Guys!

I'd like to be able to use SRV records inside dispatcher groups, so I can automatise the discovery of new backends on my network using DNS

I've tried with the following formats into the dispatcher.list file:

$group _sip._udp.sip-voice_backends $group sip-voice_backends

and none looks to be working, running the kamailio_ctl dispatcher.list won't show me the group set with SRV records. ( I also try NAPTR records, with no luck as well.)

• Does the dispatcher module support SRV or NAPTR records? (maybe my

format is not correct)

• If not, do you have any other idea on what I could do to achieve what

I'd like to do?

Thanks Alessio

---

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

Hello,

if you expect that dispatcher module will list the associated ip addresses with the hostname after a DNS SRV lookup, then this is not available.

Dispatcher module will still use the single hostname to set r-uri (or dst uri) and then TM module does the lookup before sending, inside t_relay(). Also, irc, the keepalive is sent only to the first ip resolved for a hostname.

If you want to relay on DNS SRV for loadbalancing, you don't need dispatcher at all, everything is done transparently for configuration file by tm and core.

Maybe you can detail a bit more what you want to achieve with dispatcher on this topic and we can think of alternatives,

Cheers, Daniel

On 26/01/2017 11:34, Casco, Alessio wrote:

Thanks for your help,

Unfortunately with kamailio 4.4.4, dispatcher module and your suggestions, I still don't see the SRV record picked up (at least using the kamcmd dispatcher.list command).

I didn't try the LCR module yet, I want to be sure first that dispatcher is not able to handle SRV first

Thanks Alessio

On Wed, Jan 25, 2017 at 8:06 PM, Jeremy Gadd <jeremygadd@gmail.com mailto:jeremygadd@gmail.com> wrote:

Holy cow, sorry about that!

Put the hostname in dispatcher (no port or _sip._udp) and enable
these:

use_dns_cache=on
use_dns_failover=on
dns_srv_lb=on

That's how I got it working (using the LCR module).

On Wed, Jan 25, 2017 at 1:05 PM, Jeremy Gadd <jeremygadd@gmail.com
<mailto:jeremygadd@gmail.com>> wrote:

    Put the hostname in dispatcher (no port) and enable these:


    On Wed, Jan 25, 2017 at 9:30 AM, Casco, Alessio
    <alessio.casco@nexmo.com <mailto:alessio.casco@nexmo.com>> wrote:

        Hello Guys!

        I'd like to be able to use SRV records inside dispatcher
        groups, so I can automatise the discovery of new backends
        on my network using DNS

        I've tried with the following formats into the
        dispatcher.list file:

        $group  _sip._udp.sip-voice_backends
        $group  sip-voice_backends

        and none looks to be working, running the kamailio_ctl
        dispatcher.list   won't show me the group set with SRV
        records. ( I also try NAPTR records, with no luck as well.)

        * Does the dispatcher module support SRV or NAPTR records?
        (maybe my format is not correct) 
        * If not, do you have any other idea on what I could do to
        achieve what I'd like to do?

        Thanks
        Alessio


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




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

---

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

Hello,

someone published a npm package for etcd-based discovery service, which sounds similar to what you want to do:

- https://www.kamailio.org/w/2015/10/kamailio-dispatcher-discovery-service-wit...

Alternative to dispatcher, you can also consider using rtjson module to push back destinations to kamailio in a json document via some API service.

But if you want to watch the state of destinations, then dispatcher is the way to go.

Cheers, Daniel

On 31/01/2017 11:28, Casco, Alessio wrote:

Hello Daniel!

My goal is the following: I would like to use a service discovery application (consul is an example) that dynamically guides the kamailio back-ends. As soon as a new back-end registers into the discovery service, kamailio will start sending traffic to it.

Since writing a module is not an option right now, I though about using DNS and SRV records to achieve the same result, doing so I will be able to instruct kamailio dynamically, the idea of the dispatcher group, came in my mind only because I'd like to have something outside the main kamailio config, so in the case I have to change the name or do some adjustments, I don't have to restart the entire kamailio but use a RPC command for example.

Thanks Alessio

On Mon, Jan 30, 2017 at 4:20 PM, Daniel-Constantin Mierla <miconda@gmail.com mailto:miconda@gmail.com> wrote:

Hello,

if you expect that dispatcher module will list the associated ip
addresses with the hostname after a DNS SRV lookup, then this is
not available.

Dispatcher module will still use the single hostname to set r-uri
(or dst uri) and then TM module does the lookup before sending,
inside t_relay(). Also, irc, the keepalive is sent only to the
first ip resolved for a hostname.

If you want to relay on DNS SRV for loadbalancing, you don't need
dispatcher at all, everything is done transparently for
configuration file by tm and core.

Maybe you can detail a bit more what you want to achieve with
dispatcher on this topic and we can think of alternatives,

Cheers,
Daniel


On 26/01/2017 11:34, Casco, Alessio wrote:

...

Thanks for your help,

Unfortunately with kamailio 4.4.4, dispatcher module and your
suggestions, I still don't see the SRV record picked up (at least
using the kamcmd  dispatcher.list command).

I didn't try the LCR module yet, I want to be sure first that
dispatcher is not able to handle SRV first

Thanks
Alessio

On Wed, Jan 25, 2017 at 8:06 PM, Jeremy Gadd
<jeremygadd@gmail.com <mailto:jeremygadd@gmail.com>> wrote:

    Holy cow, sorry about that!

    Put the hostname in dispatcher (no port or _sip._udp) and
    enable these:

    use_dns_cache=on
    use_dns_failover=on
    dns_srv_lb=on

    That's how I got it working (using the LCR module).

    On Wed, Jan 25, 2017 at 1:05 PM, Jeremy Gadd
    <jeremygadd@gmail.com <mailto:jeremygadd@gmail.com>> wrote:

        Put the hostname in dispatcher (no port) and enable these:


        On Wed, Jan 25, 2017 at 9:30 AM, Casco, Alessio
        <alessio.casco@nexmo.com
        <mailto:alessio.casco@nexmo.com>> wrote:

            Hello Guys!

            I'd like to be able to use SRV records inside
            dispatcher groups, so I can automatise the discovery
            of new backends on my network using DNS

            I've tried with the following formats into the
            dispatcher.list file:

            $group  _sip._udp.sip-voice_backends
            $group  sip-voice_backends

            and none looks to be working, running
            the kamailio_ctl dispatcher.list   won't show me the
            group set with SRV records. ( I also try NAPTR
            records, with no luck as well.)

            * Does the dispatcher module support SRV or NAPTR
            records? (maybe my format is not correct) 
            * If not, do you have any other idea on what I could
            do to achieve what I'd like to do?

            Thanks
            Alessio


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




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




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

-- 
Daniel-Constantin Mierla
www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
Kamailio Advanced Training - Mar 6-8 (Europe) and Mar 20-22 (USA) - www.asipto.com <http://www.asipto.com>
Kamailio World Conference - May 8-10, 2017 - www.kamailioworld.com <http://www.kamailioworld.com>