# Unable to receive "+CSDI" URC with MC8775

**URL:** <https://forum.sierrawireless.com/t/unable-to-receive-csdi-urc-with-mc8775/7954>\
**Category:** MC/EM Series\
**Created:** [May 18, 2015, 7:53pm UTC](https://forum.sierrawireless.com/t/unable-to-receive-csdi-urc-with-mc8775/7954 "2015-05-18T19:53:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cazzolungo](https://avatars.discourse-cdn.com/v4/letter/c/e9a140/32.png) [@cazzolungo](https://forum.sierrawireless.com/u/cazzolungo)\
**Post date:** [May 18, 2015, 7:53pm UTC](https://forum.sierrawireless.com/t/unable-to-receive-csdi-urc-with-mc8775/7954/1 "2015-05-18T19:53:12Z")

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Hi, I’m doing some test with Sierra Wireless modem 1.8 mc8775 with default configuration.  
The only thing I changed is AT+CNMI=2,1,0,2,0. When I send an SMS (pdu mode obviously) with SRR enabled (status report) I never see the +CSDI URC coming back!

I did exactly the same test (same PDU, same configuration) with other 2 gsm modems of different manufacturers and I correctly see the +CSDI URC coming back.

Am I missing some proprietary configuration? Is this a bug?

Thanks

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<div class="post-metadata">

**Author:** ![cazzolungo](https://avatars.discourse-cdn.com/v4/letter/c/e9a140/32.png) [@cazzolungo](https://forum.sierrawireless.com/u/cazzolungo)\
**Post date:** [May 19, 2015, 2:53pm UTC](https://forum.sierrawireless.com/t/unable-to-receive-csdi-urc-with-mc8775/7954/2 "2015-05-19T14:53:53Z")

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EDIT: I just discovered that if I set AT+CNMI=1,1,0,1,0 after sending the sms, instead of receiving the +CSD/+CSDI I always get +CMS ERROR: 321 (that is “Invalid memory index”).  
Maybe the SMS-STATUS-REPORT is coming back from the network but the device is unable to save it.