[cisco-voip] What is diff between Integrated Session Border Controller and Cisco Unified Border Element SP Edition

[GregW]

I know Service Provider edition is a simple ios upgrade...
 
This is on the new ASR 1000 series.
 
I know 1002 can not have redundant processors.
 
does anyone have core differences.
 
I have been on cisco.com a few hours this weekend and found that HA and ISSU are the main diff's between (high avail) and (in-service software ugrade) 
 
What does pay as you grow mean, is that you just purchase one size and your software licensing grows???
 
Thanks in Advance




GregW 
 
 
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