Introduction
Mitel's 5304 IP Phone is a cost-effective entry-level, two-line, dual-port IP phone with a 40-character backlit display that supports both SIP and MiNet protocols.
Steps to Convert to SIP protocol
To put the 5304 IP phone in SIP mode:
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Unplug the power to the phone.
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Press and hold both the * and 7 keys at the same time.
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While holding the 2 keys, plug the power back on.
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When the display shows “Mode Change to SIP?”, just follow the prompts.
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It will reboot and come up in SIP mode