Absolutely correct. If you purchase other SIP IP phones for your offices that you need to build and register with your CUCM network, you need to use digest credentials for these ( non Cisco ) phone types. One thing to note....the new phone will often have a web interface. Read the documentation carefully to find a link the new phone will send you to. This will often bring up a page that it gets from the phone type. Once this GUI comes up you will see all the info on the phone you need to add it to the CUCM properly.
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