[SR-Users] I think I found issue to Kamailio not forwarding ACK sent to it by Asterisk

[Wilkins, Steve]

What is actually happening is –

I M USING Kamailio 5.2 with Asterisk 14.6 and 15.3.  Asterisk cannot reach Kamailio on Public IP (Per design)

Asterisk 14.6: If Asterisk sends an ‘INVITE’ to Kamailio (on Private IP), then Kamailio sends back a ‘200 OK’ with its Public IP in both Record-Routes.
Asterisk 14.6 is changing the first Record-Route to the Private-IP of Kamailio and also changes the Via to The same Private IP, and hence the ACK is
sent to and received by Kamailio…Call works perfect. (Asterisk developers say they are not doing this!).

Asterisk >= 15.0: The above mentioned Record-Route and Via do not get changed and hence the ACK is sent to Kamailio’ s Public IP, but never makes it there (because the my firewall will not allow it).

This is why I was wondering if I could change the Record-Route on the ‘200  OK’ that is sent to Asterisk.  I just can’t figure out how to do it.

Thank you for your time!

From: sr-users [mailto:sr-users-bounces at lists.kamailio.org] On Behalf Of Federico Cabiddu
Sent: Monday, May 21, 2018 5:06 PM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] I think I found issue to Kamailio not forwarding ACK sent to it by Asterisk

Not sure I understand your scenario.
How many interfaces your kamailio has?
How's the callflow going?
Public->Kamailio->Asterisk?
Did you have a look on "advertise" parameter of core "listen" directive?
https://www.kamailio.org/wiki/cookbooks/5.1.x/core#listen

Best regards,

Federico

On Mon, May 21, 2018 at 7:32 PM, Wilkins, Steve <swwilkins at mitre.org<mailto:swwilkins at mitre.org>> wrote:
Hello,

I set that double route to ‘2’ and Kamailio still not hearing traffic coming in from Public.  I think I need to figure out how to get Kamailio to set the first RR in the ‘200 OK’ to its Private IP, because  the Server Kamailio is on may not be open to public traffic.

Thank you

From: sr-users [mailto:sr-users-bounces at lists.kamailio.org<mailto:sr-users-bounces at lists.kamailio.org>] On Behalf Of Federico Cabiddu
Sent: Monday, May 21, 2018 1:08 PM
To: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org<mailto:sr-users at lists.kamailio.org>>
Subject: Re: [SR-Users] I think I found issue to Kamailio not forwarding ACK sent to it by Asterisk

Hi,
if you have Kamailio listening on private IP and public IP you need two record-routes.
Have a look at this param of the rr module:
http://www.kamailio.org/docs/modules/devel/modules/rr.html#rr.p.enable_double_rr

Best regards,

Federico


On Mon, May 21, 2018 at 7:01 PM, Wilkins, Steve <swwilkins at mitre.org<mailto:swwilkins at mitre.org>> wrote:

Hello All,

When Kamailio  sends a ‘200 OK’ to Asterisk, it is putting its Public IP into the Record-Routes.  In Asterisk 14.6, it would send the ‘ACK’ back to the Private IP Address of Kamailio, but Asterisk 15.x is using the Public IP Address that Kamailio placed in the Record-Routes so…
Is there a way to force Kamailio to set the Record-Route to its Private IP address of the first Record-Route in messages forwarded to Asterisk?

Thank you?

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