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

Callum Guy callum.guy at x-on.co.uk
Fri Mar 12 11:38:20 EST 2021

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.


Otherwise you'll probably be able to achieve this using general
transformations, should be quite straightforward if you only have a single


Hope that helps,


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
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> Users at lists.opensips.org
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