[OpenSIPS-Users] Changing the expire parameter in the Contact field

Joseph Barrero joebarrero at gmail.com
Fri Mar 12 13:47:32 EST 2021


Unfortunately, the contact information and parameters are read-only and
cannot be set using a transformation.  I've also tried fix_nated_contact
and it appends an additional expire parameter to the end of the contact
header.  As such, I end up with, expires=486;expires=60.

- Joe

On Fri, Mar 12, 2021 at 5:41 AM Callum Guy <callum.guy at x-on.co.uk> wrote:

> Hi Joseph,
> I haven't fully digested your scenario however you may have some luck
> using the nathelper function fix_nated_contact - presuming NAT is not an
> issue.
> https://opensips.org/html/docs/modules/3.1.x/nathelper.html#func_fix_nated_contact
> Otherwise you'll probably be able to achieve this using general
> transformations, should be quite straightforward if you only have a single
> Contact:
> https://www.opensips.org/Documentation/Script-Tran-3-1#toc60
> Hope that helps,
> Callum
> On Fri, 12 Mar 2021 at 03:55, Joseph Barrero <joebarrero at gmail.com> wrote:
>> Is there a way to replace the expires parameter in a Contact header
>> within a reply route?
>> The issue I'm trying to solve is the following.
>> I have two OpenSIPS servers, a primary and a backup.  The OpenSIPS server
>> is performing mid-registrar duties for Freeswitch.  However, when I take
>> the primary OpenSIPS server down for maintenance and bring it back online,
>> Freeswitch still has the other registration active.  When the UA tries to
>> register again on the primary OpenSIPS server, the mid-register module
>> sends a request over to Freeswitch, and Freeswitch returns two contacts;
>> one contact with the modparam("mid_registrar", "outgoing_expires", 600)
>> value and the other contact with an expiration of whatever value it happens
>> to be on (in this example it is 600 - time elapsed) from the registration
>> created by the secondary OpenSIPS server.
>> The problem is that the expiration parameter in the 200 Ok reply to the
>> UA from OpenSIPS on a successful registration has the second expiration
>> value instead of the shorter expiration value set in
>> modparam("mid_registrar", "max_expires", 60).
>> The result, is that the UA goes from 60-second registrations to whatever
>> the second expiration value had at the time (a value between 0 and 599).
>> When the second expiration is higher than 60 seconds, the UA's registration
>> is expired on OpenSIPS for up to 599 seconds.
>> What I'd like to do is simply change the expire parameter in the contact
>> header to 60 seconds on the reply route.
>> Any help will be greatly appreciated.
>> Thank you,
>> Joe Barrero
>> _______________________________________________
>> Users mailing list
>> Users at lists.opensips.org
>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
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