[SR-Users] Critical Error

[Daniel Tryba]

On Thu, Dec 28, 2017 at 04:21:28PM +0000, Nicolas Breuer wrote:
> 
> I see this :
> 
> 
> SIP/2.0 183 Session Progress.
> CSeq: 1258951486 INVITE.
> Require: 100rel.
> 
> SIP/2.0 180 Ringing.
> CSeq: 1258951486 INVITE.
> Require: 100rel.
> 
> PRACK sip:3222430244 at 80.84.31.129:5060 SIP/2.0.
> CSeq: 1258951487 PRACK.
 
> Indeed after the PRACK there is no ? 18x ? packets.
 
You misinterpreted:
> I looked at the code and this log happens when a PRACK is received,
> but there was no 183 (or other 1xx) response. Can you check the sip
> traffic and see what packets are sent around?

A PRACK is a PRovisional ACKnowlegde to messages that don't need any
responses in plain old SIP. So the PRACK is a correct new message in
response to the 18X received (with req rel100).

I'm not seeing these errors in dialog on 4.4.6 setups where upstream
demands PRACK.