CVoice Chapter 2 Complete

I knocked out Chapter 2 today and I'm already almost at the half way mark in the book. The first two chapters presents a lot of theory so it makes since as to why they're probably the longest. This chapter dived into the voice signaling protocols along with some examples of how to use them. The hardest part to digest in this chapter was the fax theory (it always is). Never the less it's time to start digging into CME again finally starting in Chapter 3. I created my Mnemosyne's for chapter 2 as well so I knocked out quite a bit just today.

Mnemosyne's and Chapter Completion

I finished CVoice chapter 1 along with the review questions, I only missed one question and honestly I think it was worded poorly...oh well. I forgot about this flash card tool called Mnemosyne's, I decided to start creating flash cards for every chapter I finish. This is something quick and easy I can study while at work during any short breaks or downtime I have. I'm 160 pages in, Chapter 2 begins tomorrow!

Crossed the 100 page Marker in CVoice

I knocked out about 30 pages in the CVoice book today. The topics covered the various types of controller configurations using T1's, E1's, BRI's, and PRI's. I also went over a brief overview of Echo and Echo cancellation. There were a bunch of examples of different controller scenarios and I attempted to tackle as many as I could. For some reason I didn't have BRI commands available on my routers but that's alright as I doubt I ever use this in the real world. Once all was said and done, I threw back on the original configuration and placed my test calls. The next section dives into DSP's, I'm 128 pages in so far, the book is a little over 600.

Traditional Call Signalling Overview

I was only able to get an hour in of study this evening due to performing some after hours work on our CUCM. I'm going to be enabling dependency records so that I know what ties to what. For example knowing what configurations depend on a specific device pool or calling search space (css). I'm wanting to get rid of our call configuration for one of our remote sites that's been shut down months ago but I had a lot of troubles figuring out what was tied to what.

I eventually went up the hierarchy in my head of how you configure things in CUCM from what little knowledge I have. I removed everything from the regions, locations, device pools, etc  for this site but there's still two css's that I can't figure out what's calling out to it. I'm also going to provision some of the region settings for our new remote site since configuring regions can drop calls currently in progress.

I was able to knock out about 10 pages today along with jotting notes down about the signaling types related to Supervisory, Addressing, and Informational. I left off going over the various E&M signaling from immediate start, wink-start, delay start and the different Types I-V used with Supervisory signaling. I won't be studying tomorrow as I will be doing an after hours upgrade on our Unity Connection servers. There's a good chance I may not study Friday as well depending on how much I want to have a social night that night!

Much Better Study Session!

Thanks to the help of a co-worker I was able to resolve the issues I was having with my PRI configurations. I knew it was something to do with clocking but I was just too annoyed to research it yesterday. Apparently there's a command called isdn protocol-emulate that is used to make a Cisco router emulate as the CPE or as PSTN switch basically. I threw this on my router I'm using to emulate the PSTN (go figure) and did away with the T1 CAS's and provisioned them back as PRI ISDN lines. Sure enough the circuits came right up without any issues.

After messing with that and placing test calls, debugs, and etc. I was able to knock out 18 pages in the CVoice book, way better progress than yesterday. I'm also going through old CBTNugget videos on CVoice as there's some good refreshers on traditional telephony. My plan is to listen to one of the videos first thing in the morning time permitting. We're about to bring up our new remote site so I'm going to be knee deep in configuring Cisco devices and creating the dial plan in CUCM. This should be some good experience, we also plan on doing some clustering over the WAN by bringing up a CUCM subscriber at this new site, also good experience!

Horrible Study Session

So to start off with, yesterday I made some decent progress. I knocked out about 30 pages of reading yesterday along with buying two cheap analog phones to test out POTS dial-peers using the PSTN. Today however was a complete mess, I wouldn't say I didn't learn anything but I made it through 1/2 a page of reading! The rest was spent troubleshooting Layer1 and 2 issues with just about every WIC card I had. From the FXS card that wasn't compatible with the Cisco 2821's all the way to ISDN layer two issues with my PRI configuration.

I gave up on PRI for now and went to T1 CAS but even that gave me a lot of issues. I spent an hour trying to get one analog phone to talk to each other, something that should be rather simple. I eventually got one end to call the other but not the other way around. It took another twenty minutes to figure out that the E&M signaling type was mismatched on both ends. Somehow I blew out my entire T1 configuration on both ends (I was frustrated to say the least) and spent another hour getting the configurations just right so that the routers were able to match dial-peer configurations to their respective ports.

I pretty much wasted 3 hours on a simple configuration but I guess in the end I gained some troubleshooting experience. I just 10 minutes ago was able to make a call to both analog phones from both sites. I'm using the PSTN router as my remote site for now since I don't have a 2800 compatible spare FXS card or a spare $150 to purchase one. I'm 43 pages in to the book so far, I'm hoping to make up for lost progress tomorrow.

CCNP Voice Home Lab Nearly Completed

I retrieved most of the items on the list that I talked about yesterday, the last thing I really need for the CVoice is an analog phone. I'm thinking that I can go to Radio Shack or Walmart and buy a cheap $10 analog phone without any bells or whistles. I attached a picture above of how it looks physically, it's not the cleanest looking but it should get the job done. I had some weird issues with the HQ 2821 router not booting the startup-config. after being annoyed for 30 minutes, I looked it up online and somehow the registry setting was set to skip the NVRAM during boot-up. My guess is that this was the router I had to use password-recovery and I just forgot to change the settings back, either way it took all of 30 seconds to fix the issue.

I also read 13 pages in the CVoice book and wrote down notes between the differences of the four call-signaling protocols H.323, SIP, MGCP, and SCCP. I attached a picture above of my lab setup, there's still an analog phone and a dedicated VMWare server for the unified applications that I'm missing. I'll start putting together the VMWare server after I pass CVoice unless for some reason I absolutely need it, I don't see this happening though.