EC200U-EU firmware with IMS/VoLTE support

Technical Subjects Software General Function
1

Hi everyone / Quectel team,

We are evaluating the module EC200U-EU on the UMTS&LTE EVB kit for a handheld voice product for the EU market.

Could you please share the latest firmware package for the EC200U-EU with IMS and VoLTE support?

Please could you also confirm:

  1. Which EC200U-EU ordering code supports VoLTE
  2. Whether VoLTE and 112 emergency calls over IMS work on the Swedish networks (Telia, Tele2, Telenor, Tre).
  3. Whether the PCM interface carries the voice audio during VoLTE calls.
2

Hi @eb3310

  1. EC200UEUAA-N05-TA0AA

  2. VoLTE: yes on all four (Telia, Tele2, Telenor, Tre), and it is now the only voice path on three of them. Telenor, Tele2 and Tre shut 2G and 3G in December 2025; Telia keeps 2G only until 2027. PTS ordered those three to block, from 2 February 2026, any device that cannot reach 112 on the operator’s own network, so 112 over IMS is a go/no-go requirement, not a nice-to-have.

Module: EC200U supports VoLTE and 112 is a default emergency number. Not confirmed by us: 112 over IMS (IMS emergency registration) on EC200U-EU. That needs a field test per operator, with a SIM that actually has VoLTE enabled. Do not commit to Sweden without it.

  1. Yes. The call audio is terminated in the module and leaves on the PCM/IIS port; there is no separate VoLTE audio route.
  • AT+QAUDSW=0 for external codec. On the embedded codec (=1) nothing appears on PCM.
  • AT+QDAI sets the format. EC200U is PCM/IIS slave only: the codec must be master and drive PCM_SYNC and PCM_CLK. Channels 1 to 4, 16-bit, short frame sync.
  • ALC5616 and NAU88C10 are auto-recognised; any other codec is configured by the host over AT+QIIC.
  • AT+QAUDCFG="urc",1 reports the per-call sample rate as +QSAMPRATE, which is what you clock the codec with.

I have reached out to you via email for the requested firmware. Please check

3

Thank you @AmarRaaj for the reply!