nRF9160 won't connect to Anritsu MT8821C

[chahn-ds]

Hi,

I have an nRF9160 device which is going thru PTCRB cert.  We are doing TRP/TIS and nRF9160 won't connect to the Anritsu MT8821C.  Basically it tries to connect and just drops the call.  The strange thing is that this device connected on 2 different occasions to this callbox in the past few weeks, and we did not have this issue.  Each time using v1.3.1 firmware  I did mention to the cert team that I connected to AT&T before this 3rd run and they think that it's now locked to AT&T.  

I found a forum post about the Anritsu, and it wasn't fully resolved. 

https://devzone.nordicsemi.com/f/nordic-q-a/61927/nrf9160-unable-to-connect-to-anritsu-callbox

One suggestion was doing an at+cfun=12 to clear out settings.  I will try this tomorrow.  Does this clear out the NVM?  I found another post that said there will be a feature to clear out the NVM.

https://devzone.nordicsemi.com/f/nordic-q-a/74561/nrf9160-connectivity-configuration-help/308529

Is the at+cfun=12 the new feature to clear the NVM?

Lastly, I did see a blog post about the CMW.  Is there a similar one for the Anritsu?

https://devzone.nordicsemi.com/guides/cellular-iot-guides/b/hardware-design/posts/using-nrf9160-against-r-s-cmw500-or-cmw290-in-signalling-callbox-mode

 

Thanks,

Chris 

[JONATHAN LL]

Hi,

Is there any error or logs that you can provide from when the call is dropped? 

What the settings on the Anritsu?

Are you also in contact with Anritsu regarding the issue, most likely a configuration issue. Could it be a security mode reject for the security mode command?

Regards,
Jonathan