# Unable to perform Voice call in MC7304 modem **URL:** \ **Category:** MC/EM Series\ **Created:** [November 6, 2015, 7:25am UTC](https://forum.sierrawireless.com/t/unable-to-perform-voice-call-in-mc7304-modem/8272 "2015-11-06T07:25:20Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![sukumar441](https://avatars.discourse-cdn.com/v4/letter/s/b3f665/32.png) [@sukumar441](https://forum.sierrawireless.com/u/sukumar441)\ **Post date:** [November 6, 2015, 7:25am UTC](https://forum.sierrawireless.com/t/unable-to-perform-voice-call-in-mc7304-modem/8272/1 "2015-11-06T07:25:20Z")
Able to send and receive SMS from MC7304 modem over UMTS network but i am unable to do a voice call from MC7304 modem. Issues: 1.Unable to execute at!custom=“ISVOICEN”,1 command 2.When i dial a number using ATDxxxxxxxxxxx; command it is giving NO CARRIER responce MC7304 frimware version is SWI9X15C\_05.05.58.00 r27038 carmd-fwbuild1 2015/03/04 21:30:23 ---
**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:** [November 11, 2015, 5:14am UTC](https://forum.sierrawireless.com/t/unable-to-perform-voice-call-in-mc7304-modem/8272/2 "2015-11-11T05:14:55Z")
Hi, FW version 5.5.x.x support only data. You have to use either 4.x.x.x or 6.x.x.x FW versions for voice and data support. -Alex ---
**Author:** ![bollmann](https://avatars.discourse-cdn.com/v4/letter/b/9e8a1a/32.png) [@bollmann](https://forum.sierrawireless.com/u/bollmann)\ **Post date:** [January 5, 2016, 9:22am UTC](https://forum.sierrawireless.com/t/unable-to-perform-voice-call-in-mc7304-modem/8272/3 "2016-01-05T09:22:10Z")
Hi, I have the same problem here. Where can I get the 6.x or 4.x firmware from ? I only find the 5.X version. Thanks in advance. ---
**Author:** ![krima919](https://avatars.discourse-cdn.com/v4/letter/k/94ad74/32.png) [@krima919](https://forum.sierrawireless.com/u/krima919)\ **Post date:** [January 5, 2016, 12:23pm UTC](https://forum.sierrawireless.com/t/unable-to-perform-voice-call-in-mc7304-modem/8272/4 "2016-01-05T12:23:06Z")
> [@bollmann](#): > > Hi, > > I have the same problem here. > Where can I get the 6.x or 4.x firmware from ? > I only find the 5.X version. > > Thanks in advance. The module that you have is a data only module with FW v5. It should not be upgraded to FW v6. You need to order a specific SKU that supports data + voice. ---
**Author:** ![bollmann](https://avatars.discourse-cdn.com/v4/letter/b/9e8a1a/32.png) [@bollmann](https://forum.sierrawireless.com/u/bollmann)\ **Post date:** [January 5, 2016, 2:14pm UTC](https://forum.sierrawireless.com/t/unable-to-perform-voice-call-in-mc7304-modem/8272/5 "2016-01-05T14:14:21Z")
Thanks for your reply. So there are two different MC7304 modems out there. MC7304 voice and 7304 data only ? I bought it based on the following information: MC73xx LTE/HSPA+/GSM/GPRS/EDGE/EV-DO Rev A/1xRTT modules, with data speeds up to 100Mbps downlink and 50 Mbps uplink and based on the latest chipset. MC7354/50/50-L/04 feature LTE Quality of Service, VoLTE\*\*/CSFB voice on 3G/2G/CDMA 1xRTT network and an extended set of LTE bands covering worldwide operators. url [gowifi.co.nz/specs/Sierra\_W … odules.pdf](https://www.gowifi.co.nz/specs/Sierra_Wireless_AirPrime_MC_Series_Intelligent_Embedded_Modules.pdf) ---
**Author:** ![silverkits](https://avatars.discourse-cdn.com/v4/letter/s/48db29/32.png) [@silverkits](https://forum.sierrawireless.com/u/silverkits)\ **Post date:** [January 14, 2016, 7:35pm UTC](https://forum.sierrawireless.com/t/unable-to-perform-voice-call-in-mc7304-modem/8272/6 "2016-01-14T19:35:20Z")
> [@bollmann](#): > > Where can I get the 6.x or 4.x firmware from ? I have exactly same question. I was not able to download it from sierra site but from distributors site. > [@krima919](#): > > The module that you have is a data only module with FW v5. It should not be upgraded to FW v6. > You need to order a specific SKU that supports data + voice. Why is it so? Datasheet shows that it supports digital voice. I upgraded my MC7304 to 06.03.32.04. lsusb showed audio interfaces and audio device “was found” by linux. However I did not test it further. ---
**Author:** ![sukumar441](https://avatars.discourse-cdn.com/v4/letter/s/b3f665/32.png) [@sukumar441](https://forum.sierrawireless.com/u/sukumar441)\ **Post date:** [February 4, 2016, 5:04am UTC](https://forum.sierrawireless.com/t/unable-to-perform-voice-call-in-mc7304-modem/8272/7 "2016-02-04T05:04:48Z")
Hi, I tried firmware version 5 for data call and 6.3 for voice call. i want to check both voice and data at the same time is there any build supporting both data and voice at the same time With Regards P S Reddy ---
**Author:** ![mastajaxx](https://avatars.discourse-cdn.com/v4/letter/m/fbc32d/32.png) [@mastajaxx](https://forum.sierrawireless.com/u/mastajaxx)\ **Post date:** [May 1, 2019, 4:05pm UTC](https://forum.sierrawireless.com/t/unable-to-perform-voice-call-in-mc7304-modem/8272/8 "2019-05-01T16:05:43Z")
> [@Rex\_alex](#): > > 6.x.x.x FW versions Where to get version 6 firmwares? ---
**Author:** ![beat.berger.3](https://avatars.discourse-cdn.com/v4/letter/b/50afbb/32.png) [@beat.berger.3](https://forum.sierrawireless.com/u/beat.berger.3)\ **Post date:** [September 30, 2020, 12:54pm UTC](https://forum.sierrawireless.com/t/unable-to-perform-voice-call-in-mc7304-modem/8272/9 "2020-09-30T12:54:29Z")
Where can i find the FW 6.03.32.02?