EC25AUX VoLTE/IMS registration issue

IoT Modules LTE Standard Module
1

Dear all,

We are currently using below EC25AUX module.
EC25AUXGAR08A15M1G

ims is enabled but ims registration to carrier fails.
+QCFG: “ims”,1,0

According to the packet trace obtained from carrier side, their SIP 401 response mandates AKAv1-MD5:
WWW-Authenticate:
Authentication Scheme: Digest
Realm: “ims.mnc003.mcc454.3gppnetwork.org”
Nonce Value: “BxX5hwrI8wAunIWeHPcx0mJIwS3w90toaR6XPtve4vE=”
Algorithm: AKAv1-MD5
Integrity Key: **********************************
Cyphering Key: **********************************

However, our EC25AUX followup SIP REGISTER does not switch to AKAv1-MD5.

   Authorization: Digest 
        Authentication Scheme: Digest
        Nonce Value: ""

We confirms that the SIM card is VoLTE functional through testing on smartphones.

Would our EC25AUX just does not support AKAv1-md5 thus causing the registration faiure or there is some AT commands that can enable it?

We highly appreciate your advice and ideas.

2

Hi，

Thank you for your detailed description.
Please provide the return value of AT+QGMR.
I need this information to confirm internally whether the current version supports the AKAv1-MD5 authentication algorithm.
Please also provide the return value of the following AT command:
AT+QNVFR=“/nv/item_files/ims/IMS_enable”
AT+QCFG=“ims”
AT+CGDCONT?

3

Hi, thanks for your advice, here below shows further information about the ec25.

AT+QGMR
EC25AUXGAR08A15M1G_A0.300.A0.300
OK

AT+QNVFR=“/nv/item_files/ims/IMS_enable”
+QNVFR: 01
OK

AT+QCFG=“ims”
+QCFG: “ims”,1,0
OK

AT+CGDCONT?
+CGDCONT: 1,“IPV4V6”,“”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0
+CGDCONT: 2,“IPV4V6”,“ims”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0
+CGDCONT: 3,“IPV4V6”,“SOS”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,1
OK