I am using a SPA400 on France Telecom PSTN line.
But it gets only from ~ each second incoming call the CID.
Before I used a SPA3102 without any problem.
I tried to use the same values of the SPA3102 in the SPA400.
But in the SPA400 I do not have the same values, which I need to setup correctly the CID detection.
Here the values which works fine with a SPA3102 in France :