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Login to the phone
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Goto the Ext1 top left tab
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Proxy and Registration section put your servers domain.tld in the proxy field
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Subscriber Information section put the extension number for Display Name and User ID
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Password put the extensions password
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Click Submit All Changes at the bottom
Once you have that done, make sure the p-time is set to 0.020
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Click the advanced option at the top right
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Goto the SIP tab at the top
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Scroll down to the RTP Parameters section and make sure the RTP Packet Size field has 0.020
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Click Submit All Changes at the bottom