Channel types - non-IP

• POTS cards (Digium, Zapata, Voicetronix, etc.)

• TDM Digital (AdTran VoFR, Digium E1/T1, etc.)

• CAPI (ISDN card support for Linux ISDN driver)

• USB dongle for FXS

• Modem drivers for certain modems

• Speaker/headphones via soundcard

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