Panasonic NCP500 SIP DTMF problem

[tesleeds]

I have a NCP500 running 8 x SIP trunks ok + 25 digital extns.
I want to connect a SIP doorphone unit where I will need to send DTMF back from the
SIP device to open a door relay.
Installed 4 x SIP activation keys = OK
Set up 1 x SIP extension EXT 222 to simulate the SIP doorphone. This is working ok.
Except, that the SIP extension 222 will not send MF tones.
I understand why this is and have now installed a IP-GW as per Panasonic guide. Making the incoming = Inband and pointing it to my IPCMR 192.168.20.200.
Changed CO25 to = TG8 etc. Prog looks ok, but something must be wrong!
If I try dialling 808248(248 = Digital extension) it fails to connect.(CO not assigned)
In other words this virtual trunk does not work.

Error log is displaying code 322/IP-GW Gateway Registration Error
and also - Code 136 - IP extension or trunk limitation over.
(Not sure if this one is relevant)

Anyone out there had to set this up that works for me.

Thanks

 

[obtsystems]

Have you enough sip trunk licences

 

[tesleeds]

Yes, Additional licenses added.

 

[obtsystems]

Have you asigned some of the ip trunk licences to be gateway trunks