[asterisk-users] "Retransmission Timeout" results in dropped calls after 32 seconds

[Andrew Martin]

----- Original Message -----
> From: "Joshua Colp" <jcolp at digium.com>
> To: "Asterisk Users Mailing List - Non-Commercial Discussion" <asterisk-users at lists.digium.com>
> Sent: Wednesday, May 13, 2015 10:50:02 AM
> Subject: Re: [asterisk-users] "Retransmission Timeout" results in dropped calls	after 32 seconds
> 
> Andrew Martin wrote:
> > Since some packet loss is a possibility, I assume the protocol has
> > mechanisms
> > for dealing with it. What should be happening differently in the
> > communication
> > when packet loss occurs? Should the phone just be re-sending the OK,
> > instead of
> > printing "<0>  | ERROR | receive a request with same cseq??" to its log? Or
> > should
> > Asterisk be starting with a new cseq on each INVITE retry?
> 
> The 200 OK should be retransmitted until an ACK is received. It honestly
> looks like the phone can't talk to Asterisk and it's just generally
> screwing up signaling.
> 

Thanks for the clarification and help debugging this problem. I will work
with the phone vendor to see if they can resolve this from their end. If you
have any other ideas about how to disable re-INVITEs on the asterisk side,
beyond what I have done already, please let me know.

Thanks,

Andrew