Good Morning Ernestas,
Thank you for your response to my query. I will expand my description:
I run the RUTX09 in bridge mode because the Router is not as capable as my DrayTek (DT) 2925, I require LDAP capabilities which are presently missing from the RUTX UI.
I have the RUTX09 working well in bridge mode with the DT2925 as the main router using one SIM.
Yesterday I inserted a second SIM, put the MOB1S2A1 into bridge mode and entered the MAC address of the DT2925 just as I did with the MOB1S1A1. I saved these preferences.
I then went to MOB1S1A1 and enabled SIM switch based upon data usage. I saved these preferences.
I then went to MOB1S2A1 and enabled SIM switch (I assumed this would be required to enable a return to the MOB1S1A1 at the end of the 24 hour day) I saved these preferences.
After re-establishing connection via MOB1S1A1, we encountered significant issues with LDAP dependent WiFi calling.
I then switched off the MOB1S2A1 WAN from within the UI and saved these preferences. The issues with LDAP dependent WiFi calling continued.
I then removed the second SIM and restarted the RUTX09. The issues with LDAP dependent WiFi calling continued.
It was not until I went to Restore Configuration and uploaded the backup file I had saved that normal LDAP dependent WiFi calling resumed.
Based upon my business needs I cannot afford to compromise this functionality and therefore I will not be trying anything new until the weekend, including a FW update.
I hope this additional detail helps to communicate the technical aspects of the issue to greater effect. Thanks. Pete.