[cisco-voip] Configuring H.323 Calling Name Display

[Mike King]

I'm looking to configure H323 Calling Name Display..

http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb-gw-cm.html#wp1324664

It provides 4 ways to configure this:

Voice Class Level - With Buffering
Voice Class Level - Without Buffering
Voice Service Level - With Buffering
Voice Service Level - Without Buffering

I have a 2921, with a single PRI providing service to this branch office
(Also providing SRST)

My question, what's the difference between buffering and without buffering?
also,
Would I have to configure it at both the Voice Class and Service level, or
just one of the two?  If it's just the one, I'm assuming the Voice Service
level would make the most sense for a single T1 type environment.

Mike
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