Which topology is more robust (PSAP)?

Answered Question
Feb 9th, 2007

Hi, I have an exercise here that I can't quite understand why 'Diagram B' and not A is the best answer. If you have a chance, can you please help me understand why 'Diagram B' is the best choice? Please find diagram attached.

Thank you very much!

Question:

"You have a customer that has a site which is connected to two

different PSAP areas for E911 emergency calls. The current legacy

PABX has been provividing service for all telephones on the campus.

The client is now looking to install Cisco CallManager. Which of the

solutions will provide 'seamless' connectivity between the

legacy PABX, the Cisco CallManager and the 2 PSAPS ?

Please refer to the attached diagram."

I have this problem too.
0 votes
Correct Answer by Paolo Bevilacqua about 9 years 7 months ago

Hi News,

Diagram B is good because a single router connects everything and PBX has also direct links to PSTN.

Diagram A is bad because PBX and CCM have no links.

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Correct Answer
Paolo Bevilacqua Fri, 02/09/2007 - 16:55

Hi News,

Diagram B is good because a single router connects everything and PBX has also direct links to PSTN.

Diagram A is bad because PBX and CCM have no links.

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