VoIP Pilot and the info or Point one need to know ?--URGENT

Hi There,
As the subject say, is the Cisco way of VoIP solution is the best of industry. currently we are running a VoIP pilot with Cisco provided solution but just was cusrious that
1)WHAT ALL ONE NEED TO LOOK OUT AND KEEP IN MIND WHILE DESIGNING A VoIP SOLUTION FOR EXISTING TELEPHONY SETUP?
2) IS ONE GO FOR H.323 OR SIP BASED SOLUTION OR SCCP.. WHAT FACTORS TO KEEP IN MIND TOWARDS SELECTION one of this protocol..
Thanks in advance and eagerly await your answer..

Hi,
to keep one Point in mind will not help...
There are many factors and no "One fits all" solution. So in general: know your requirements, know your constraints, keep an eye on budget and do not forget to get early enough the proper skill level for your staff to operate the solution.
Best starting point for technology related information would be to read through the "Cisco IP Telephony Solution Reference Network Design" guides.
Examples:
Cisco IP Telephony Solution Reference Network Design (SRND) for Cisco CallManager 4.0 and 4.1
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_implementation_design_guide_book09186a00805fdb7b.html
MeetingPlace 5.3 Solution Reference Network Design (SRND)
http://www.cisco.com/application/pdf/en/us/guest/netsol/ns268/c649/ccmigration_09186a00805749ac.pdf
More can be found at
http://www.cisco.com/en/US/netsol/ns340/ns394/ns165/networking_solutions_packages_list.html
Hope this helps! Please rate all posts.
Regards, Martin

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