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hairpinning vs shuffling

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9mmgeek

9mmgeek

MIS
Jun 29, 2005
225
US
I think I understand what they are, but that makes me wonder why they are both turned on. It seems like you would either shuffle or hairpin.

From the IP telephone implementation guide:
"Direct IP-IP Audio and IP Audio Hairpinning are generally enabled,".
I see this is true in the network regions and on the stations.

Is it just to "allow" a station to use either not to "force" one or the other? Can they detect when a call is set up whether the other end can handling direct IP or not?
 
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Code: 
Hairpinning
Unlike the IP-TDM-IP connectivity option, hairpinning requires that all media processing resources for a given call reside on a single TN2302AP or TN2602AP media processing circuit pack or a single G350 or G700 Media Gateway VoIP Media Module. A hairpinned call is
originally set up as an IP-TDM-IP call, but once the set-up process is complete, no TDM resources are required. However, resources on the Media Processing circuit pack or VoIP Media Module are required for the duration of the call. A Media Processing circuit pack and a VoIP Media Module each house an onboard Central Processing Unit (CPU) and Digital Signal Processors (DSPs).

Shuffling
A shuffled call relinquishes all TDM and media processing resources after call setup. Therefore, the media stream of a shuffled call traverses only an IP network. This is the most commonly used mode of connectivity between two IP endpoints in the same system.

I would assume that both are enabled to allow for changing Media Processor requirements during the day when calls are being made. First using hairpinning and then when DSP resources are running low, it switches to shuffling to free up those DSP resources.

Someone please correct me and clarify this if I'm wrong.
 
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