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Koppar releases USB-C LTE modem for computer phone line

Creator addresses VoLTE support and carrier dependency

6 Oct 31 5:53 PM · 11d ago · 1 comment · 1 source · development 6 of 6

The developer clarifies that the Quectel EC25-EUX modem natively supports VoLTE, and the audio path is identical regardless of whether calls use VoLTE or 2G/3G fallback. However, VoLTE support in practice depends on carrier whitelisting and the correct carrier MBN profile being loaded on the module, not on the PCB design itself.

Creator addresses VoLTE support and carrier dependency
github.com

“Yes, the Quectel EC25-EUX supports VoLTE natively on the modem baseband, and from the board's perspective the audio path is identical: the modem handles the IMS/SIP registration and AMR codec internally and outputs standard 1.8V PCM digital audio to the RP2040 whether the call is over VoLTE or 2G/3G fallback.”

abijahkaj

abijahkaj Hardware designer / project creatorKoppar AI Design-to-manufacturing service

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