H.225 Trunk

• Also called gatekeeper controlled intercluster trunk
• Used to connect:
  • CUCM 3.2 or later
  • All other H.323 device
  • CUCME

• Under Device > Gatekeeper > Add New add gatekeeper

• Under Device > Trunk > Add New add trunk

• Associate previously configured gatekeeper with the trunk

• Configure Route Pattern to point to trunk

• The Gatekeeper does not need to be configured with the CUCM IP as it is learned when the CUCM registered to it
• The technology prefix is like a specialty of the registered endpoint
  • E.g. 2# could means video
  • If we dial 2#12345, the gatekeeper will not only look at the prefix but also the technology prefix before deciding on which entities to forward the call
• Bandwidth
  • If default is specified instead of a zone name, it will apply to all zones.
  • Unit in kbps and is twice the bandwidth of the audio codec payload (without layer3 overhead)
    • G.711 = 2 x 64kbps = 128kbps
    • G.729 = 2 x 8kbps = 16kbps
  • Interzone
    • Applies to all calls coming in to and going out of the specified zone (interzone calls)
  • Total
    • Applies to all calls in the specified zone (interzone and intrazone calls)
  • Session
    • Applies to each call in the specified zone (specifies the max bandwidth per call)

gatekeeper
  bandwidth {interzone | total | session} {default | zone <zone-name>} <kbps>

• If the Gatekeeper CAC reject the call, we can use Route list to reroute the all over the PSTN