Unable To Create Channel Of Type ‘SIP’ (cause 20 – Unknown)

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  • Scott Huang wrote:
    When you use a dynamic host type, the device needs to register to Asterisk in order to be dialed. Otherwise there is no way to for Asterisk to know what address to send the invite to and Asterisk will make chan_sip issue the cause 20 error you are seeing. If the device has a static IP and you don’t want to deal with registration, you could always change the host to that IP address. Alternatively you could just figure out how to get your devices to register to your Asterisk server.