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I am bit confused with the name convention for the sip domain when it comes to edge deployment on the edge external certificate.
Is it a must that i should include my sip domain as sip.domian.com or i can use a different name such as lync.domain.com.....
A Microsoft communications service that provides communications capabilities across presence, instant messaging, audio/video calling, and an online meeting experience that includes audio, video, and web conferencing.
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You need to add sip.<domain> because it is your SIP domain in your topology.
The following picture shows the DNS and certificate requirements for your reference:
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