Strange UDP Network Issue FreePBX Distro 5.211.65-14 on ESXi 5.0

Distro Discussion & Help
1

Hello.
I installed FreePBX Distro 5.211.65-14 from ISO on a VM (ESX 5.0).
I’m having strange network issues: the extensions become lagged, audio problem, etc.
It seems that network is saturated and UDP packets are lost.
Someone has the same issue?
Thanks

2

Lots of broadcast packets could do it too.

Are the phones in their own VLAN???

3

There is only one LAN. The previous version of FreePBX works properly in the same environment.
Using then new FreePBX the UDP stack goes crazy when there are concurrent calls.
It looks like several UDP packets are lost or delayed by UDP stack.
[2014-08-25 23:20:59] NOTICE[15788]: chan_sip.c:23705 handle_response_peerpoke: Peer ‘0123456789’ is now Lagged. (2018ms / 2000ms)
[2014-08-25 23:21:09] NOTICE[15788]: chan_sip.c:23705 handle_response_peerpoke: Peer ‘0123456789’ is now Reachable. (6ms / 2000ms)
The issue could be related to ESXi 5.0 or SHMZ release 6.5 or both.