# RC7620-1 not making VoLTE calls

**URL:** <https://forum.sierrawireless.com/t/rc7620-1-not-making-volte-calls/30030>\
**Category:** RC76\
**Created:** [June 20, 2023, 9:49am UTC](https://forum.sierrawireless.com/t/rc7620-1-not-making-volte-calls/30030 "2023-06-20T09:49:30Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![GaryATodd](https://avatars.discourse-cdn.com/v4/letter/g/ebca7d/32.png) [@GaryATodd](https://forum.sierrawireless.com/u/GaryATodd)\
**Post date:** [June 20, 2023, 9:49am UTC](https://forum.sierrawireless.com/t/rc7620-1-not-making-volte-calls/30030/1 "2023-06-20T09:49:31Z")

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I have an RC760-1 (R8 firmware) with an EE SIM. I have configured for LTE only (KSRAT=5). However, the module will no longer make VoLTE calls. Immediately after issue the ATD command, the module responds with ERROR. It used to work OK but has been failing for last few days. Any ideas why?  
See below for the AT!GSTATUS? response prior to dialling (I have changed the dial number for obvious reasons):  
AT+CSQ;+CESQ  
+CSQ: 14,99  
+CESQ: 99,99,255,255,16,27  
OK  
AT!GSTATUS?;DT12345678901;  
!GSTATUS:  
Current Time: 209…Temperature: 34  
Modem Mitigate Level: 0…ModemProc Mitigate Level: 0.  
Reset Counter: 1…Mode: ONLINE  
System mode: LTE .PS state: Attached  
IMS reg state: NOT REGISTERED .IMS mode: Normal  
IMS Srv State: NO SMS,NO VoIP  
LTE band: B3 …LTE bw: 10 MHz  
LTE Rx chan: 1761…LTE Tx chan: 19617  
LTE CA state: INACTIVE  
EMM state: Registered .Normal Service  
RRC state: RRC Idle  
PCC RxM RSSI: -84…RSRP (dBm): -113  
PCC RxD RSSI: -97…RSRP (dBm): -139  
Tx Power: --…TAC: 2C8D (11405)  
RSRQ (dB): -11…Cell ID: 0069EA03 (6941187)  
SINR (dB): 4.6  
ERROR

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**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:** [June 20, 2023, 9:56am UTC](https://forum.sierrawireless.com/t/rc7620-1-not-making-volte-calls/30030/2 "2023-06-20T09:56:49Z")

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could it be sim card or network problem as you said that it was working before?

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**Author:** ![GaryATodd](https://avatars.discourse-cdn.com/v4/letter/g/ebca7d/32.png) [@GaryATodd](https://forum.sierrawireless.com/u/GaryATodd)\
**Post date:** [June 20, 2023, 10:06am UTC](https://forum.sierrawireless.com/t/rc7620-1-not-making-volte-calls/30030/3 "2023-06-20T10:06:41Z")

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Perhaps, but I would have thought that a network problem would have been resolved by the operator after a few days. The SIM is the same one that I used several days ago when VoLTE calls were working OK.

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**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:** [June 20, 2023, 10:15am UTC](https://forum.sierrawireless.com/t/rc7620-1-not-making-volte-calls/30030/4 "2023-06-20T10:15:05Z")

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maybe it worths to try other operator to isolate if this is network problem