Hi!!
I have a working GXW4104. My current configuration is as follow:
Trunk
Outbound Routes
Inbound Routes
In the GXW4104 or GXW4108
Use DEFAULThere
Leave ALL BLANK here, because We are configurating the GXW410x as a PEER and not with a SIP account.
Channel Setting
DIALING
Check With this configuration, Use a softphone to test (zoiper or xlite for example).
Hope this help, this took me 15 minutes of my life jaja.
Greetings from Chile!!