getting "Error code:0x91 from Main.CnxAocDial"

[nnetala]

Hi All

I have established a VPN connection from my PC(Intel,Windows XP) to the customer OXO/PBX(AMD,Linux), through ADSL modem.
I have a PIMphony application(soft phone) installed in my PC.
After establishing VPN connection from my PC to PBX, when i try to run PIMphony application it is giving an error message : "Error code:0x91, from Main.CnxAocDial".
And the soft phone is not opening.

Any kind of help is highly appreciated.

Thanks & Regards.
Naresh