Hello again, After reviewing the sysmoQMOD manual, it seems this should be possible. The ATSAM4S4B has two USARTs, on the QMOD each one is routed to its own modem. We could however route them both to a single modem but to distinct SIM inputs. On the remsim server, we could then prepare the slot maps which would include the bank slot, client id, and the client slot. If each client shall support two SIM slots, then we’d have two slot entries in the slot map, one for client slot 0 and another for 1. On the remsim client we’d call the server with the unique client id and client slot. Not sure yet how to test this but can you please confirm this is feasible? [cid:image002.png@01DAEF38.6AE3EC20] Thanks Sohail Arshad Chief Engineer, McLaren Applied +44 (0) 74483 837566 sohail.arshad@mclaren.com<mailto:sohail.arshad@mclaren.com> mclaren.com/applied [Image] McLaren Applied Ltd Block E, Dukes Court, Duke Street, Woking, GU21 5BH From: Sohail Arshad &lt;sohail.arshad(a)mclarenapplied.com&gt; Date: Thursday, 15 August 2024 at 15:39 To: simtrace(a)lists.osmocom.org &lt;simtrace(a)lists.osmocom.org&gt; Subject: Dual SIM client support CAUTION: This email originated from outside of McLaren Applied Ltd. Do not click links or open attachments unless you recognise the sender and know the content is safe. Report any suspicious emails using the 'Report Phishing Email' button in Outlook. Hello, I have a functioning setup of remsim as follow: * An x86 server that hosts a sysmoOCTSIM board. This server runs the bank daemon and also the remsim server. * An ARM64 client that hosts a SIMtrace2 board, and a 5G modem with two SIM inputs to support dual SIM single standby (DSSS). The SIMtrace2 connects to SIM slot 0 on the 5G modem via a flexi. * I use the remsim-apitool to create the slot map and assign SIMs to the client using the server IP, bank ID and client ID. Client slot is always 0. I’d like to allocate two SIMs in the bank to this one client using only one ATSAM4S microcontroller to utilise the DSSS function of the modem e.g. SIM slot 1 in the bank is mapped to SIM slot 0 on the 5G modem for client ID 1. SIM slot 2 in the bank is mapped to SIM slot 1 on the same 5G modem for client ID 1. Is this possible with the current implementation of remsim? I cannot find any reference to this in the archives or in the manuals. Thanks The contents of this e-mail are confidential and for the exclusive use of the intended recipient. If you are not the intended recipient you should not read, copy, retransmit or disclose its contents. If you have received this email in error please delete it from your system immediately and notify us either by email or telephone. The views expressed in this communication may not necessarily be the views held by McLaren Applied Limited. Dukes Court, Block E, Duke Street, Woking, GU21 5BH, United Kingdom Company Number: 02322992 The contents of this e-mail are confidential and for the exclusive use of the intended recipient. If you are not the intended recipient you should not read, copy, retransmit or disclose its contents. If you have received this email in error please delete it from your system immediately and notify us either by email or telephone. The views expressed in this communication may not necessarily be the views held by McLaren Applied Limited. Dukes Court, Block E, Duke Street, Woking, GU21 5BH, United Kingdom Company Number: 02322992