Connecting PABX via PPTP

RouterOS General
1

Hi,

I got an issue with two PaBX units which are installed at remote offices and connected via ADSL where the ADSL routers has got port 1723 forwarded through their firewalls to the MT units.

To connect them, I run a PPTP connection between the Mikrotiks as I dont need a secure connection and it works great.
I can connect from any pc to the control panel of the remote PABX BUT the two PABX units or any sip phones does not connect the remote PABX.

does pptp transport udp traffic?
do i need to forward any other ports to the MT units?
what other reason might it be?

i dont use NAT as i have routed both networks.

2

PPTP uses TCP 1723 for control purposes. You also need protocol 47 forwarded. PPTP can certainly carry UDP traffic - it can actually even carry layer 3 protocols other than IP.