[SR-Users] Question about using Kamailio and Asterisk and flow of an "INVITE"

Wilkins, Steve swwilkins at mitre.org
Sun May 13 16:31:03 CEST 2018

Yes, that is what has me a little boggled.  If I don't, calls do not go through so I am obviously confused, but that is how I was finally able to get full duplex calls working.

In Asterisk, I have a Kamailio endpoint listening for traffic from Kamailio. How would Asterisk know the Contact information if Asterisk does not re-contact Kamailio for that Information (since all the registration information is on Kamailio).
I was under the impression that it is best to keep the registrations on Kamailio, why forward them.  Below is my pjsip.conf.
When a user calls 30001 at (Kamailio IP), the call is registered in Kamailio, and Asterisk can contact Kamailio to get the 
Contact information it needs.  


media_address= //Asterisk PBX IP



type=identify  ; Must be of type identify (default: "")

[30001](webrtc) //tls endpoint


contact=sip:30001 at

Am I totally wrong, even though it works?

Thank you all very much!

-----Original Message-----
From: sr-users [mailto:sr-users-bounces at lists.kamailio.org] On Behalf Of Alex Balashov
Sent: Sunday, May 13, 2018 9:19 AM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] Question about using Kamailio and Asterisk and flow of an "INVITE"

On Sun, May 13, 2018 at 01:14:08PM +0000, Wilkins, Steve wrote:

> In my configuration I have to use Asterisk as my PBX, and I use 
> Kamailio in front of Asterisk accepting and inspecting calls.  I have 
> many AORs, for which a phone can register to.  I have noticed that, 
> depending on the call, when a call arrives it gets REGISTERED in 
> Kamailio (I do not forward the registration to Asterisk); Kamailio 
> sends the INVITE to Asterisk, and then Asterisk send the INVITE back 
> to Kamailio.  The calls seem to work fine (Duplex Audi/Video).  I 
> think I know why the INVITE is forwarded to Kamailio but have not been 
> able to work around it; the AOR's all have a Contact of Kamailio and I 
> think this is the reason for the forwarding of the INVITE.  If I don't 
> set Kamailio as the Contact for the AOR's, calls do not work.

Are you sure that you are using the word AOR correctly? 

If you're not forwarding registrations to Asterisk but instead storing them in Kamailio's registrar, setting the Contact binding of an AOR to have the address of that very same Kamailio registrar would make no sense.

Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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