Retransmission Timed out Error !!! / SOS / HELP !!!

[gequiros]

Hello guys

here is what i got:
1 DB = 32gb = 24 cores = SSD
1 Web = 16gb = 16 cores = SSD
4 Asterisk / Dialers = 8gb = 16 cores = SSD
codec: ulaw


When i speed up dialing i get:
========================================================================================================
[Mar 22 19:49:00] WARNING[1455]: chan_sip.c:4039 retrans_pkt: Retransmission timeout reached on transmission 4bea9bd2482d5f282248875e38ceeaf6@100.100.100.100:5060 for seqno 102 (Critical Request) -- See https://wiki.asterisk.org/wiki/display/ ... nsmissions
Packet timed out after 6401ms with no response
========================================================================================================


I contact my switch NOC, they did a PCAP and pretty much they said that under "HEAVY" load ( 1,24 was its peak) ASTERISK is NOT able to handle properly answering to responses, i tried several switches out there and on all of them i got same error, i can even duplicate this easily.

NOC from actual SWITCH wrote me on SKYPE the following:

========================================================================================================
The platform is first of all retransmitting invites way to fast
second it is ignoring the 200 OK
And ignoring the subsequent BYE because the INVITE is never ACKed
In fact it basically looks like it is ignoring EVERYthing we send back
Cause it keeps sending ivites all the way up through several 200 OKs
INVITEs rather

Looks like their system is unable to do message handling at that load
So to recap: on these 2 calls their system ignored ALL responses from our system

65837b1779cd022c6dedbb0531343529@100.100.100.100:5060
4bea9bd2482d5f282248875e38ceeaf6@100.100.100.100:5060
========================================================================================================

here i attach a screenshot of PCAP
https://snag.gy/LYwxAJ.jpg


Thanks for any help you can provide me...

Ps:
I know is not a hack, all IPs blacklisted, and only ones allowed are: My Switch and my Call Center IPs / Using a Hardware Firewall

[Vince-0]

It's probably a NAT problem.

Set your externip in sip.conf.

[gequiros]

All my servers have PUBLIC IP address:

externip = has the correct public IP ( I can't disclose that here )
nat=force_rport,comedia
canreinvite=no
;directrtpsetup=yes

Should i add the following?:
udpenable=yes
tcpenable=yes
preferred_codec_only=yes

Any help, will be really appreciated !!

Thanks !