How do I configure Intercom capability for 79xx phones.Currently utilizing CCM4.2.
if this is CUCM 4.2 then there is no intercom capability, at most you can configure a speed-dial on one phone and auto-answer with speakerphone on the other one. you would need CUCM 6.x for intercom
if this is CME follow this guide
Configuring Intercom Lines
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