Sir, I am Vinay Sawant fromm India(Mumbai). I am asking about VOIP, VOICE, POTS, GATEKEEPER & GATEWAY.
The current setup:-- 6 Hub Location routers(Cisco 3640) the two FXS cards each. I have configured Pots and VOIP dial-peer. My Boss has asked me to configue a Gatekeeper and Gateway instate of configuring POTS and VOIP on each and every router. Please tell me why gatekeeper and Gateway are usefull here than manual configuration. And how to configure it
Gatekeeper is used to provide address translation, call admission control, and bandwidth management among other things. It allows you to configure dial peers one one centeral router and allow the other gateways to point to this router which simplifies dial peer administration. Also, call admission control can be a compelling reason to use gatekeeper especially if you're not using a call processing component such as Callmanager. Gatekeeper becomes very useful in large deployments. It's usefulness for 6 sites could be debated. Here are a couple of links to take a look at.
ur pretty close to where u need to be. Couple of things to keep in mind.
1. U will eventually have to use the Analog card s to route calls outside ur VoiP network, for example if u want to call a regular phone.
2. One dial-peer can have only one destination pattern and but you can for sure summarize it. like if ur example, you are trying to route 222 to 225, so u can either use a pattern of 22. (The last is a dot which is used in the conf to say any digit) or use something like 22 (This one means the first 2 would be 22 and the 3rd can be either 2,3,4,5.
Also, this config only gets into the Gateway side, so you still need to configure the Gatekeeper.
If u dont create a GK, you will have to do much more routing than with the GateKeeper.
As I'd mentioned, you can use one destination-pattern per Dial Peer, u can still use wild card and use multiple destination patterns as one. For example, when you configure DEL Gateway, you can create one pattern for 224 and 225 by using the pattern 22 here. it would match 224 and 225 and another one for 110 and 111 using dest pattern of 11. When you configure a set of digits within the  (Square Brackets as u mite call it) it can match any one of the digits and when u use a . it would match anything from 0-9.
Also, when using this configuration, you will point it to the Gatekeeper using the command "session target ras"
To explain my last line, what I meant was that when you have large number of sites and keep adding dial-peers to each site, you need to know each and every Gateway's IP Address and keep adding them. When using the Gatekeeper, you only configure the Gateway to send the call to the Gatekeeper and that will make the final routing decission. As your sites increase, it is always more easy to use gatekeepers than Gateways.
The above example is keeping security and routing loops in picture. You can even create one single dial-peer on the router with the destination pattern of "T" where the Gateway would send all calls to the Gatekeeper. If I have to compare it with the Data Network, it is more like creating a default route on the Gateway.
Gateways and Gatekeepers is a very extensive topic. I'd recommend reading docs about them to get more info. It would not be possible for anyone on the forum to take you through complete configuration of Gateways and Gatekeepers.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...