Originally there were 15 analog phones on the same line - all ring when the number was called and the first to pick up got the call.
Adding the 7906 single line phones to replace the analog phones and to add an additional feature of 911 identification for each phone: each phone currently has...
Cisco CM 7.1.2.xx, 7906 and 7940 series phones
Layout:
15 - 7906 phones, each with a separate 4-digit DN, DN is masked/tied to local 911 facility - 911 center will receive masked number with specific details identifying individual phone locations (need to keep individual DN per phone for 911...
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