# RC7620-1 problem registering to the network **URL:** \ **Category:** RC76\ **Created:** [October 11, 2022, 3:12pm UTC](https://forum.sierrawireless.com/t/rc7620-1-problem-registering-to-the-network/28095 "2022-10-11T15:12:03Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![jan.krchnak](https://avatars.discourse-cdn.com/v4/letter/j/7c8e57/32.png) [@jan.krchnak](https://forum.sierrawireless.com/u/jan.krchnak)\ **Post date:** [October 11, 2022, 3:12pm UTC](https://forum.sierrawireless.com/t/rc7620-1-problem-registering-to-the-network/28095/1 "2022-10-11T15:12:03Z")
We are having issues with RC7620-1 modem connection to the network in specific places like Australia while no issue in other places. The modem starts OK and we get the **CREG: 0** and **CREG: 2** but nothing else after that. It just hangs there until our 5 minute timeout. I have tried to set RAT switching to auto and using \*PSRDBS command to set supported frequency bands. ```auto ATE1 OK ATZ OK AT+KSLEEP=2 OK AT&D0 OK AT&K3 OK AT!MUSLEN=1 OK AT+CPMS="ME","ME","ME" +CPMS: 0,255,0,255,0,255 OK AT+CNMI=2,1,0,0,0 OK AT+CMGF=1 OK AT+CMEE=1 OK AT+KSREP=1 OK AT+KSRAT=0 OK AT+CREG=1 OK AT+CGREG=1 OK AT+COPS=3,2 OK AT+COPS? +COPS: 0 OK AT&W OK at*psrdbs=1,524288 OK at&w OK at+cfun=1,1 OK +CREG: 0 +CGREG: 0 +CEREG: 0 +CREG: 2 +CGREG: 2 +CEREG: 2 +WDSI: 0 +SIM: 1 +KSUP: 0 at+CEREG? +CEREG: 2,2 OK at*psrdbs? *PSRDBS: 524288 OK at+creg? +CREG: 1,2 OK at+cgreg? +CGREG: 1,2 OK at+ksrat=? +KSRAT: (0,1,2,4,5,7,9) OK at+ksrat? +KSRAT: 0 OK ``` Here are the modem details: Manufacturer of modem: Sierra Wireless, Incorporated Type of modem: RC7620-1 Modem firmware version: SWI9X07H\_00.08.07.00 0ce4c1 jenkins 2021/03/17 02:18:20 Modem Baudrate: 115200 I tried switching to the supported frequency bands B1 and B3 in Australia using the \*PSRDBS command ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [October 11, 2022, 3:53pm UTC](https://forum.sierrawireless.com/t/rc7620-1-problem-registering-to-the-network/28095/2 "2022-10-11T15:53:43Z")
Did you set APN correctly? What is the return of at!impref? What is at!gstatus? Did you find problem on Release 9? ---
**Author:** ![jan.krchnak](https://avatars.discourse-cdn.com/v4/letter/j/7c8e57/32.png) [@jan.krchnak](https://forum.sierrawireless.com/u/jan.krchnak)\ **Post date:** [October 11, 2022, 5:08pm UTC](https://forum.sierrawireless.com/t/rc7620-1-problem-registering-to-the-network/28095/3 "2022-10-11T17:08:11Z")
APN? is that necessary for network registration? I set APN before trying to connect to the server, but before then I check if the modem is registered to the network using AT+CREG? command with a response of either 1 or 5. I have not tried any other Firmware, do you mean I should upgrade the modem Firmware to release 9? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [October 12, 2022, 12:00am UTC](https://forum.sierrawireless.com/t/rc7620-1-problem-registering-to-the-network/28095/4 "2022-10-12T00:00:11Z")
I think APN is needed for LTE network. yes, you can try Release 9 BTW, you need to isolate if this is SIM card issue. ---
**Author:** ![jan.krchnak](https://avatars.discourse-cdn.com/v4/letter/j/7c8e57/32.png) [@jan.krchnak](https://forum.sierrawireless.com/u/jan.krchnak)\ **Post date:** [October 12, 2022, 11:38am UTC](https://forum.sierrawireless.com/t/rc7620-1-problem-registering-to-the-network/28095/5 "2022-10-12T11:38:15Z")
Yes, setting APN before waiting for connection works. Thanks for that information. ---
**Author:** ![simon1](https://avatars.discourse-cdn.com/v4/letter/s/fbc32d/32.png) [@simon1](https://forum.sierrawireless.com/u/simon1)\ **Post date:** [August 21, 2023, 2:21am UTC](https://forum.sierrawireless.com/t/rc7620-1-problem-registering-to-the-network/28095/6 "2023-08-21T02:21:09Z")
I am having the same issue. Can you confirm that this is resolved by issuing “AT+KCNXCFG=…” (setting the APN) before waiting for network registration “AT+CEREG”? The order of commands we are using to initiate a connection frequently fails: AT+KSREP? (check SIM card is active) AT+CEREG? (wait for network, we frequently get undocumented result code 4 here, but proceed when status 1 or 5 is returned, this will often report 2 ‘searching for an operator’ in known good coverage areas) AT+KCNXCFG=… (set the APN, configure the connection) AT+KTCPCFG=… (configure the TCP socket) AT+KTCPCNX=… (this is where the weirdness starts, but that is for another time) Can you confirm that issuing KCNXCFG before testing the network with CEREG is the recommended order? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [August 21, 2023, 2:28am UTC](https://forum.sierrawireless.com/t/rc7620-1-problem-registering-to-the-network/28095/7 "2023-08-21T02:28:26Z")
the APN for network registration should be set by AT+CGDCONT. ---
**Author:** ![simon1](https://avatars.discourse-cdn.com/v4/letter/s/fbc32d/32.png) [@simon1](https://forum.sierrawireless.com/u/simon1)\ **Post date:** [August 21, 2023, 2:37am UTC](https://forum.sierrawireless.com/t/rc7620-1-problem-registering-to-the-network/28095/8 "2023-08-21T02:37:12Z")
Can the AT+KCNXCFG command be omitted if the PDP context is configured with AT+CGDCONT? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [August 21, 2023, 2:42am UTC](https://forum.sierrawireless.com/t/rc7620-1-problem-registering-to-the-network/28095/9 "2023-08-21T02:42:11Z")
If just for network registration in AT!GSTATUS, i remember there is no need to set +KCNXCFG But seems you need to set up +KTCP command, so you also need to set APN in +KCNXCFG