[SR-Users] Kamailio propagates 180 and 200 OK OUT OF ORDER

[Alex Balashov]

On Wed, Apr 08, 2020 at 01:30:21PM +0000, Henning Westerholt wrote:

> There is also the option to do an asynchronous sleep (with the async)
> module on the message that you want to delay but still processing
> other messages during it.

We have a buggy endpoint that consistently sends reinvites immediately
following the e2e ACK, and substantially simultaneously with the ACK. It
quite often happens that the re-invite goes out the door before the ACK,
which is of course rejected by the target due to inconsistent state.

We solved this a somewhat nasty hack using just the very technique you
mentioned -- we use the async features of Kamailio to 'delay' all
re-invites about 50 ms. It does solve this problem, if a bit
suboptimally and at the cost of eccentricity and complexity.

-- Alex

-- 
Alex Balashov | Principal | Evariste Systems LLC

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