[OpenSIPS-Users] Dealing with duplicate packet's.

Bogdan-Andrei Iancu bogdan at opensips.org
Thu Oct 26 05:50:54 EDT 2017

Hi Kevin,

If the SIP request are perfectly identical, they may be re-transmissions 
- what is the time between the packets ?


Bogdan-Andrei Iancu
   OpenSIPS Founder and Developer

On 10/20/2017 12:41 AM, Kevin Stewart via Users wrote:
> I am having some issues with intermittent packet duplication in the 
> network.
> what this looks like currently is
> opensips gets 2 identical Invite packets.
> opensips processes them returning 2 401's with 2 different nonce values.
> opensips then gets 2 Authed Invite packets
> processes the first one and invalidates the nonce.
> another thread is simultaneously processing the other one and sees the 
> invalid nonce and returns a 401.
> the first thread forwards the valid invite and 100's to the A party 
> and eventual returns a 180 but the A party ignores this because it got 
> a terminal response (401) for that invite.
> I was wondering is there a mechanism do identify duplicate CSeq 
> numbers in a session so we can drop them in opensips?
> Yes I am trying to get the source of the duplication identified but it 
> is currently breaking authentication and call setup.
> Kevin
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