Can't access certain clients through openVPN

[leo_1988]

Hi guys,
At my office I have a pfsense router with openvpn remote accesses server (ssl/tls + user auth) which is working great.
The vpn is mostly used for pbx connection with android softphones.
I recently needed to use a yealink T23G SIP device through the vpn and I saw that I had to use ssl/tls only in order to export the config file with the client export utility and import it into the device.
So, I created a new vpn server through the wizard with the same settings except the tunnel network and Server mode which is ssl/tls only and the yealink T23G is online now.
Problem is that when I use the new VPN I can’t access the pbx server but I can access other devices and servers on the network.
Pbx has 2 network cards 192.168.3.1 on another VLAN 192.168.1.230 on my LAN
Any ideas?

Info below

Old VPN (works well)
Tunnel net : 10.20.4.0/24
Lan net:192.168.1.0/24

dev tun
persist-tun
persist-key
cipher AES-128-CBC
ncp-ciphers AES-128-GCM
auth SHA256
tls-client
client
resolv-retry infinite
remote 84.85.xx.xx 1194 udp4
verify-x509-name "vpn-Certificate" name
auth-user-pass
pkcs12 link-UDP4-1194-lm.p12
tls-auth link-UDP4-1194-lm-tls.key 1
remote-cert-tls server

new VPN (not working properly)
Tunnel net : 10.20.5.0/24
Lan net:192.168.1.0/24

dev tun
persist-tun
persist-key
cipher AES-128-CBC
ncp-ciphers AES-128-GCM
auth SHA256
tls-client
client
resolv-retry infinite
remote 84.85.xx.xx 1195 udp4
verify-x509-name "vpn-Certificate" name
pkcs12 link-UDP4-1195-lm.p12
tls-auth link-UDP4-1195-lm-tls.key 1
remote-cert-tls server

rules