"Buzz In" Intercom With Camera Recommendations?

I work for a K-12 school district that is considering putting in intercom systems where a person could walk up to the school main door, then use a voice and video system to talk with (and be seen by) the secretary. The secretary could then buzz them in, if appropriate. The doors they would use currently do not have any access control on them (we will probably have to add access control to the doors, tie it in to our existing Lenel system, and install a door open switch for the secretaries). We could add an IP camera for each door and then have the secretary have it pulled up on a brower, but I would like to know if anybody has any recommendations for a standalone commercial level voice and video system.

Any cost estimates would also be appreciated. We are looking at about 8 to 10 buildings.

Thanks,

Andy Lee

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