Does anyone here have some experience with the DG-104S, a four-port station gateway running MGCP? I can call a phone connected to the gateway, but when I want to make an outgoing call, I just get dial tone, the DTMF seem to be ignored and in the telnet console of the gateway I get the message “DIM: tone off TCID 0 has no DSP”.
After hours of googling the DG-104 and the hardware identical Clarent CPG-101, and after many useless configuration changes I tried something easy: swapping the phone. Now it works fine. 
It seems that the DTMF generated by the first phone isn’t loud enough to be recognized. However, this phone does work well on the PSTN.
Even with the good phone I get the same message whenever I pick up the phone and go back on hook without dialing. To me the “TCID has no DSP” part sounded like a configuration problem or a broken DSP, but apparently it isn’t. At least not in this case. 