I've installed a Grandstream system (UCM 6510) plus 80 extensions. Calling is working great.
I have a Page button for users to use when paging all extensions and our overhead PA speakers.
When I press the button we have to wait about 10 or 15 seconds before we can speak... It seems that we are waiting for all the extensions to activate or something before we can talk.

Any thoughts on how to shorten that delay?

Thanks