A1. the gatekeeper is not a must in this situation. You can bypass it by using static dial-peers pointing destination patterns of each site to the IP of the Gateway at that site. This could be really labor intesive, because you will have to build as many dial peers as there are sites on each of the gateways. it could get worse if a site supports more than one pattern too. The gatekeeper could be used for administrative functions such as restricting bandwidth and other, but you don't have to have one, at least not yet.
A2. yes, you can configure the HQ 3640 as your GK. I can't tell you how many GWs it can handle, but i will suggest you watch that CPU util. very closely. Since cisco GK only handles initial RAS and DRQs, you won't have much to worry about if you only have up to 5 remote sites.
Q2.1) If I do not have Gatekeeper, I can't restrict the bandwith for a particular link. Suppose if I already have two voice calls in a 32K link. When the third voice call comes ( as it will happen most of the time in a practical situation ), since there is no sufficient bandwidth, can it cause degradation of all three voice calls ?
Q2.2) What is the IOS should I use for the gatekeeper option for 3640 ( is it H.323 OR Gatekeeper license ? )
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
Over the last few months, I have had the privilege of working on SI...
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