Thanks for pointing out Michael. , going through the SIP trace to see the headers for this.

So, looking through the traces, I think Session-Expires is not really the issue. The problem appears when the Re-INVITE after 90min is unable to reach other side due to transport layer session closed and hence call dropped.

On Wed, Nov 22, 2017 at 12:20 PM, Michael Jerris <mike@jerris.com> wrote:

sounds like session timers. A sip trace of the whole call should show you how those are being negotiated.

> On Nov 22, 2017, at 12:14 PM, SamyGo <govoiper@gmail.com> wrote:
>
> Hi.
>
> Can anyone tell which setting in FreeSWITCH leads to triggers an automatic Re-INVITE exactly at 90min mark of the call?
> I've tried to find the number 90 or 5400 in config directory but no results, is this internal to freeswitch core ?

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