OpenVPN tunnel disconnects frequently

[Ozy]

Hi team,

we are having an issue with T4x phones on V82 with OpenVPN.

We are using the pfSense in-built OpenVPN server and the Client Export wizard T38(2) option. VPN tarball loads fine and phones connect and work fine.
Sites with just one T4x phone, the tunnel is stable over weeks.
Sites with multiple T4x phones often re-establish the tunnel, in general under 24 hours. Randomly this re-connect fails all together and the tunnel is down. Only way to fix this is to restart the phone.
We have run syslog with verb 6, however I can't see anything that indicates the problem.

Has anyone come across this issue?

OpenVPN config is as per Yealink whitepaper.

Quote:dev ovpns3
verb 6
dev-type tun
tun-ipv6
dev-node /dev/tun3
writepid /var/run/openvpn_server3.pid
#user nobody
#group nobody
script-security 3
daemon
keepalive 10 60
ping-timer-rem
persist-tun
persist-key
proto udp
cipher BF-CBC
auth SHA1
up /usr/local/sbin/ovpn-linkup
down /usr/local/sbin/ovpn-linkdown
local 203.174.129.186
tls-server
server 192.168.55.0 255.255.255.0
client-config-dir /var/etc/openvpn-csc/server3
tls-verify "/usr/local/sbin/ovpn_auth_verify tls 'TQMS-OpenVPNServer' 1"
lport 4194
management /var/etc/openvpn/server3.sock unix
max-clients 500
push "route 192.168.254.0 255.255.255.0"
push "dhcp-option DOMAIN tqms.net.au"
ca /var/etc/openvpn/server3.ca
cert /var/etc/openvpn/server3.cert
key /var/etc/openvpn/server3.key
dh /etc/dh-parameters.1024
persist-remote-ip
float
topology net30
push "route 192.168.11.0 255.255.255.0"

Thanks for any pointers that let us fix this.