Trouble on last step of Quick Start guide

I am trying to install Asterisk on a Linux machine with Ubuntu. I followed the quick start guide ( to a “T”. When I got to step 22, making a test call, I ran into an issue.

When dialing ext 2600 I get “bearercapability notauth”

On step 18 I entered my local servers local IP address ( into Voiper SIP Account options, is that what is supposed to go there? If I change it out to the example IP they give on step 12 of the quick start guide ( it seems to work but I don’t get any audio, it then times out at 32 seconds. I have checked my audio on youtube and it works.

When configuring the iax.conf file I put the host as Is that correct?

I am a serious noob, so hopefully I explained that well enough.