CC-7975G Not Registering on FreePBX 17 While Cisco 7821 Works

FreePBX Endpoints
1

I attempted to register my Cisco CC-7975G phones using the configuration below multiple times, but it was unsuccessful. What should I do to fix this?

In the same FreePBX 17 system, I had previously registered Cisco 7821 phones, and those are working.

true SIP admin cisco D/M/Y Afghanistan Standard Time 172.30.31.254 Unicast true 2000 5060 5061 172.30.31.254 true 0 SIP75.9-2-1S false false 0 1 0 0 0 0 1 1 1,7 08:30 00:10 00:59 1 1 1 0 96 0 96 2 0 3804 false 5060 true true x--serviceuri-cfwdall x-cisco-serviceuri-pickup x-cisco-serviceuri-opickup x-cisco-serviceuri-gpickup x-cisco-serviceuri-meetme x-cisco-serviceuri-abbrdial true 2 true true 2 0 0 true 6 10 180 60 5 120 120 5 500 4000 70 false None 1 false true true false g711a 101 3 avt true false 3 1 false 10 false 16384 32766 5060 184 0 dialplan.xml 105 false 9 Media 105 Media 105 USECALLMANAGER 5060 2 3 105 abc123 false 1 *97 4 5 true false false true 
		</sipLines>
</sipProfile>
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