Cisco How To Use a Third Party SIP Phone (eg. Avaya, 3CX)
Most relevant config points from my video here.
1.) Create a new End User
The most important part is setting the "Digest Credentials", that is the password that the phone will use to authenticate.
2.) Add a New Phone
Device -> Phone
3.)
Set a fake MAC address in the right format eg. AAABBBCCCDDD.
Remember to assign the phone to the user you created earlier.
Set the "Third-party SIP Device Basic - Standard SIP" security profile as below.
Scroll down and set the Digest user to the user we sent earlier.
Remember to create a DN, your phone will then authenticate with the DN as the username and the password of the "Digest User".
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