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Installing SIP firmware on 6921 without a call manager

Hi there

1. How can I install SIP firmware (cmterm-69xx-sip.9-2-2-7.cop) on the cisco 6921 phones without a Cisco Call Manager?

2. I want to use the 6921 phones with a third party SIP server, e.g. with Broadsoft. Are there any cisco recommendations around this, or warnings?

Thanks in advance

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