Asterisk cannot route 3102 FXO call to 3102 FXS

[cannfoddr]

Guys,
I just setup my first SPA3102 using loads of really useful information from the internet. I can route an incoming PSTN call from the FXO to asterisk where it gets answered by an IVR. The IVR then attempts to route the call to a ring group which includes the 3102 FXS port registered as en extension (I can get an asterisk hotel style alarm call setup from this extension and get asterisk to call it back at the chosen time - seems to be working).

The FXS NEVER rings when there is an incoming call - I check the main asterisk log and I can see:

Unable to create channel of type 'SIP' (cause 3 - No route to destination)

From what I read the SPA3102 should be capable of doing this - my intention is to route all incoming calls on the FXO to asterisk and then use various VOIP phones and the house wiring connected to the 3102 FXS to answer the calls.

I know I can do this with the Digium card but I am trying to move to a virtualised Asterisk server.

SPA3102 is running the latest firmware I could find on the Cisco Site:

Product Name: SPA-3102 Serial Number: FM600H514108
Software Version: 5.1.10(GW) Hardware Version: 1.4.5(a)
MAC Address: 000E08CF8A1D Client Certificate: Installed
Customization: Open

Any and all information appreciated.

Adrian