INE Labs and a Quick MGCP Tip

Slowly but surely I'm making through the Sybex CVOICE book, I'm about 65 percent of the way the through. I've been going through the hands on labs in the book as well, utilizing the INE rack rentals since I'm unable to access real equipment at the moment. I'm not going to lie, just figuring out how to connect to their labs have been difficult...for me. I tried the VPNless method and the Cisco VPN client methods so far. Using the VPNless method I couldn't connect to a lot of the equipment for whatever reason. When using the Cisco VPN client, it seemed to work a lot better but I couldn't access anything else outside of the the lab rack.

I'm sure this has more to do with me than anything else to be honest with myself. The racks are designed for people prepping for CCIE so in the back of mind I feel as though my comprehension of the technology itself is preventing me to wrap my head around on how to correctly connect to their equipment. I may be wrong though, at least I'm able to accomplish what I need so far. I believe over time I'll become more familiar on how to properly connect to everything. If not I'm not afraid to ask for help.

MGCP TIP:

I'm sure most of you know this, in order for MGCP to work correctly and pull the XML file from CUCM, the name on the voice gateway and the CUCM must have the same exact name!

Well it was bound to happen but I'm finally broken in at my new job and made my first mistake that caused downtime for a few sites. I was tasked with installing a template on all of our gateways which included giving them our domain name.

The official syntax for this is ip domain-name domainname; the use of this command changes the name of the Cisco device. So if your device host name is called Gateway and you add the domain name to the device i.e. ip domain-name contoso.com, the official name for the device is now Gateway.contoso.com. Even though the device considers Gateway.contoso.com to be its name, the host name will still appear as just Gateway when you're staring at the CLI.

Unless you changed the name to Gateway.contoso.com on CUCM as well, it will not know how to reach this device. The trickiest part about this is that it doesn't rear it's head right away, Our gateways didn't use the new name until exactly 12:00 AM the following Saturday after I gave them their new domain info. Watch out for this!

Almost Ready to Buy Rental Time

I've been slowly working through the Sybex CVoice book while also getting acclimated to my new job role. I'm about half-way through the book and I should be plunking down some cash to rent some lab time from INE pretty soon.

Cisco SAF Videos for Free on INE

I'm just writing this note to remind myself that I can view the INE videos on SAF for free.

http://blog.ine.com/2012/04/18/call-control-discovery-via-service-advertisement-framework-part-1-of-6/

 I still have a ways away before I start truly studying on this topic but I'm going to need all the help I can get. In other news, I start a new role as Network Engineer (may not be the official title) in a week for a global company. I'm pretty excited but nervous at the same time, I should be able to soak up a ton of knowledge from this new opportunity.

I have to give back my 2821's and I'm not in a position to spend $1400-2000 to replace them. Plus I would really need to get the 29xx models at this point in time. I'm going to start renting lab time because this will save me time, money, and physical space.

I've Been Hitting the Books Slow but Steadily

It's been a very busy month both personally and professionally. I would be lying if I said failing the CVoice exam didn't make me just want to give up on certs all together. With that said I still managed to finish QoS book and I'm working my way though the Cisco Voice Gateways and Gatekeeper book. I then will finish that up with the Sybex CVoice book and start labbing again. The QoS book grew my knowledge A LOT but I def. couldn't take everything in but that doesn't matter because this books goes above and beyond the QoS material I've read in the official book and even the test I failed.

I hope to sit this test again in the next month or so depending on what my $$$ funds look like.

Failed a Certification Test for the First Time Ever

Well long story short, I had my CVoice test scheduled for today and I failed miserably by almost 100 points. I needed a 790 out of 1000 to pass and I only managed a 694. When it came down to it, I wasn't prepared for the questions that were going to be asked on the exam. The material I was using to study wasn't adequate enough to get me through. The thing is that there isn't much material for the CCNP: Voice to begin with so I'm not sure what else to do besides go through the book again and schedule a retake for some time in the near future. My hands on is where it needs to be but my theory isn't.

You have to know ALL of the mathematical formulas, how to convert DSCP to decimal, Make sure you have a very good understanding of QoS (Specific QoS books), and find some outside material to understand CUBE more if you don't work with it. This was an expensive mistake, I'm pretty down right now, I'm going to go through the material and focus on the areas I did horrible on and go from there. The practice exam questions I was using from Cisco's learning network website and the official book aren't nearly as difficult as the exam.

Configured Gatekeeper's for the First Time

I finally did something that I was dreading to do for a long time...configure a H.323 Gatekeeper. It wasn't to bad but I will need to lab it again before the test I'm sure. There's just a slew of commands to remember to get everything up and working properly between the endpoint and gatekeeper. Even the instructor in VOD I was following along with was having issues getting everything up and running. He spent about 25 minutes troubleshooting what turned out to be a codec mismatch issue between dial-peers on two different gateways lol.

I'm having this weird intermittent call issue with my gatekeeper and phones though, I wonder if it has something to do with the voice-class codec I have configured but I may be wrong.

Always Troubleshoot the Obvious

I wasted 90 minutes in today's lab troubleshooting an issue that the IOS told me might cause the issue to begin with. I upgraded my 2821 lab routes to a newer IOS 15 version so that I can lab some Gatekeeper scenarios. I knew about this problem in the past but by default, the newer IOS versions (at least voice specific) enables a configuration to prevent Toll-Fraud. It's called ip address trust authenticate which requires that all IP addresses that attempt to place calls to a gateway be added to a list that allows the call to be place.

Now while I knew about this I figured it wasn't enabled since I already had configured my router and looking in my running-config this command was no where to be found. I went ahead and issued the no ip address trust authenticate command under the voice service voip configuration and sure enough I could place H.323 calls again.