Not all Huawei USB modems work out of the box, on some of them voice calling capability has to be enabled first, some need to be upgraded with the latest firmware.

This is however not required on the newer 512MB models, or when using a powered USB hub. In case you are using one of the older 256MB models with F1 and F2 still in place, you might want to consider bridging over F1 and F2, read more details here.

If you want to use 2 modems, an additional WiFi connection or other devices that require considerable amount of current, a powered USB hub is absolutely required. If your power supply does not provide enough current to power both the RPi and the modem, you can get problems booting the RPi, or calls to/from the GSM network fail with error “dongle disconnected”.Īlternatively a powered USB hub can be used as well. Read the full compatibility list here.īefore connecting the modem to your RPi, be sure to use a power supply rated at least 1A, better 1.2A or more. Hardware requirementsĬhan_dongle is able to work with many different USB modems from Huawei, such as K3715, E169 / K3520, E155X, E175X, K3765 and others.

A highly affordable GSM VoIP gateway can be obtained using Huawei E155X or compatible USB modems and chan_dongle, providing both inbound and outbound calls on GSM/3G networks.

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