1140e SIP endpoint gets '500 not implemented' from CS1K Node

[coldblaze]

I am running a CoRes CS1K 7.5. I am trying to register an 1140e SIP endpoint to the server, but everytime I try, the TLAN/Node returns a 500 not implemented message back.

I thought I had built everything necessary to support this, including a:

Node,
SIPgw,
D-Channel,
Zone,
Customer,
SIP Line,
and SIPL Telephone.

I am not sure what I am missing that might cause this message to be sent.

My tracing/debugging skill in the CS1K is not great, and I am not sure where to look for the answer.

Thanks