# receiving SMS during call **URL:** \ **Category:** Legacy HL Series\ **Created:** [February 7, 2014, 10:06am UTC](https://forum.sierrawireless.com/t/receiving-sms-during-call/7018 "2014-02-07T10:06:26Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![labouillemarc](https://avatars.discourse-cdn.com/v4/letter/l/35a633/32.png) [@labouillemarc](https://forum.sierrawireless.com/u/labouillemarc)\ **Post date:** [February 7, 2014, 10:06am UTC](https://forum.sierrawireless.com/t/receiving-sms-during-call/7018/1 "2014-02-07T10:06:26Z")
Hi, I don’t understand why this modem don’t be able receive SMS during call active. I don’t show the +CMTI? there is a AT command can be activate SMS reception during calling? marc ---
**Author:** ![Rex\_alex](https://avatars.discourse-cdn.com/v4/letter/r/73ab20/32.png) [@Rex\_alex](https://forum.sierrawireless.com/u/Rex_alex)\ **Post date:** [February 12, 2014, 12:41pm UTC](https://forum.sierrawireless.com/t/receiving-sms-during-call/7018/2 "2014-02-12T12:41:41Z")
Hi, Which module you are talking about and FW? ---
**Author:** ![ThomasKammer](https://avatars.discourse-cdn.com/v4/letter/t/f9ae1b/32.png) [@ThomasKammer](https://forum.sierrawireless.com/u/ThomasKammer)\ **Post date:** [February 18, 2015, 3:02pm UTC](https://forum.sierrawireless.com/t/receiving-sms-during-call/7018/3 "2015-02-18T15:02:49Z")
Hi, I have a similar Issue with Hilo V2. During call, I want to recieve and read text messages. I get my first CMTI, read my SMS - no probs. When receiving more SMS during the same call, the module resets itself. I am able to reproduce this behavier with max 4 SMS. Different modules with FW 5.03 and 6.00 behave the same. Using hterm and HiLo miniEval board: ```auto 14:08:09.629: *PSCSC: 1, 10,, "+49684181abcde", 145, 0,,, 14:08:09.641: *PSCSC: 1, 11,,,,,,, 14:08:10.740: *PSCSC: 1, 13,,,,,,, 14:08:10.746: +CRING: VOICE ATA 14:08:13.860: *PSCSC: 1, 14, 0,,,,,, 14:08:13.866: OK sending SMS 14:08:38.230: +CMTI: "ME",28 around 14:08:40 AT+CMGR=28 14:08:40.640: +CMGR: "REC UNREAD","+49176219vwxyz","","15/02/18,14:02:56+04" 14:08:40.657: this is a test 14:08:40.675: OK sending 3 SMS within 5 secs 14:08:48.800: +CMTI: "ME",29 around 14:08:49 AT+CMGR=29 14:08:56.658: +KSUP: 0 14:08:58.076: +CREG: 2 14:09:01.170: +CREG: 1 14:10:07.511: +CMTI: "ME",30 14:10:13.196: +CMTI: "ME",31 ``` Any solutions/suggestions? ---
**Author:** ![ThomasKammer](https://avatars.discourse-cdn.com/v4/letter/t/f9ae1b/32.png) [@ThomasKammer](https://forum.sierrawireless.com/u/ThomasKammer)\ **Post date:** [February 20, 2015, 1:51pm UTC](https://forum.sierrawireless.com/t/receiving-sms-during-call/7018/4 "2015-02-20T13:51:58Z")
Hi, today I´ve tested some more. Sending messages each 10 seconds after recieving and reading the latter worked. This gives a period of aproximatly 13 seconds - with a delay of 3 seconds between sending and receiving. A period of 8 seconds seemed to be OK too. Going down to 6 senonds the module makes a restart. Bug? Feature? Thomas P.S.: Receiving and reading lots of messages in shot time while not in voice call works fine. ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [February 20, 2015, 3:44pm UTC](https://forum.sierrawireless.com/t/receiving-sms-during-call/7018/5 "2015-02-20T15:44:20Z")
Are you being sure to wait for the Final OK response and the message reference for each message before starting to send the next ❓ The limiting factor on outgoing message rate is the network - 13 seconds sounds about right… A mobile module really isn’t a great solution for bulk message sending… ---
**Author:** ![ThomasKammer](https://avatars.discourse-cdn.com/v4/letter/t/f9ae1b/32.png) [@ThomasKammer](https://forum.sierrawireless.com/u/ThomasKammer)\ **Post date:** [February 23, 2015, 7:08am UTC](https://forum.sierrawireless.com/t/receiving-sms-during-call/7018/6 "2015-02-23T07:08:43Z")
First things first: thank you for the reply. This was an unclear statement: > [@ThomasKammer](#): > > Sending messages each 10 seconds after recieving and reading the latter worked. Sending was done from a mobile, the Hilo module is and was only the receiving end. I had an indication when the message was read and then sent the next. So: reading / indication → 10s → sending from mobile → ~3s → CMTI: → reading / indication … - works reading / indication → 5s → sending from mobile → ~3s → CMTI: → reading / indication … - works reading / indication → 3s → sending from mobile → ~3s → CMTI: → fails Even an added delay (first 0.2, later 4 senonds) between CMTI and reading made no difference. ---
**Author:** ![ThomasKammer](https://avatars.discourse-cdn.com/v4/letter/t/f9ae1b/32.png) [@ThomasKammer](https://forum.sierrawireless.com/u/ThomasKammer)\ **Post date:** [March 5, 2015, 3:50pm UTC](https://forum.sierrawireless.com/t/receiving-sms-during-call/7018/7 "2015-03-05T15:50:37Z")
News, bad news! Module on Hilo Mini Eval Board (so no interferense from my application) was in call. I sent 5 SMs from my cell phone to Hilo within ~3 seconds. Module restartet! Help?!