[cisco-voip] Qs: G/K Technology Prefix

[Syed Khalid Ali]

In cisco press ebook Cisco Voice G/W and G/K, the author says: {section: E.164 Number Resolution}

1- The Tech Prefix is optional feature.
2- To use technology prefixes:
Assign the gateway a technology 
prefix You can do this on the gateway so that the prefix is registered 
with the gatekeeper as part of the RRQ. You can also configure it statically on 
the gatekeeper so that the technology prefix is associated with the gateway IP 
address.
This identifies the technology (type, class, or pool) that the 
gatekeeper associates with this particular gateway when performing call routing.This means that I can assign the Tech Prefix either on G/W or the GK?

But in the next chapter (17) section: configuring basic g/k functionality, it include the Tech Prefix both on G/K and G/W. 

Is it mandatory for configure tech prefix on both g/w and g/k?

Can any one explain?

Regards,
Khalid
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