Unified Communications Infrastructure

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What are the mandatory fields needed to setup/register the SIP phone manually.Also, if someone can let me know the mandatory fields for Cisco based SIP phone and also the third party SIP hard phones like Avaya or any other Third party SIP phones both...

hi, guys        my customer want to have an upgrade job for their cucm which version is 8.6.2 -21900 un-restricted  to cucm 10.5 restricted versionas we known that , the un-restricted version can not be upgraded to restricted version directly, so we ...

Qiyu Bao by Beginner
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