Mar
19
I just finished up 2 weeks of a really great CCNP Voice bootcamp, covering all 5 of the latest 8.0 version exams from Cisco (CVOICE, CIPT1, CIPT2, CAPPS, & TVOICE). All in all we ended up with 62 completely brand-new hours of informative video that we are sure you will be excited to watch when they are posted to our streaming and download sites here in probably just about a week. We went fairly in-depth on most every topic, one of them being MGCP during our TVOICE section of class. BTW, with... Read More
Feb
11
This isn't exactly the latest news, and doesn't effect the CCIE Voice Lab exam (although it very well may effect the new CCNP Voice exams), however I am hearing more and more how people are upgrading their Voice routers with newer 15.x IOS code, and not realizing how existing (working) VoIP calls are being broken due to new, intelligent feature default configurations. Last July, Cisco decided (wisely, IMHO) to create a new style of Toll-Fraud prevention to keep would-be dishonest people from... Read More
Feb
09
Lab's 1 & 2 from INE's current CCIE Voice Volume II Workbook have been completely re-written from the ground-up, and have now been pushed to all subscribers in their INE Members area. Read More
Nov
08
Abstract This publication discusses the spectrum of problems associated with transporting Constant Bit Rate (CBR) circuits over packet networks, specifically focusing VoIP services. It provides guidance on practical calculation for voice bandwidth allocation in IP networks, including the maximum bandwidth proportion allocation and LLQ queue settings. Lastly, the publication discusses the benefits and drawbacks of transporting CBR flows over packet switched networks and demonstrates some... Read More
Oct
17
Computing voice bandwidth is usually required for scenarios where you provision LLQ queue based on the number of calls and VoIP codec used. You need to account for codec rate, Layer 3 overhead (IP, RTP and UDP headers) and Layer 2 overhead (Frame-Relay, Ethernet, HDLC etc. headers). Accounting for Layer 2 overhead is important, since the LLQ policer takes this overhead in account when enforcing maximum rate. Read More
May
02
A voice lab rack usually utilizes dedicated piece of hardware to simulate PSTN switch. Commonly, you can find a Cisco router in this role, with a number of E1/T1 cards set to emulate ISDN network side. It perfectly suits the function, switching ISDN connections between the endpoints. Additionally, it is often required to have an “independent” PSTN phone connected to the PSTN switch, in order to represent “outside” dialing patterns - such as 911, 999, 411 1-800/900 numbers. The most obvious way... Read More
Feb
26
Catalyst QoS configuration for IP Telephony endpoints is one of the CCIE Voice labs topics. Many people have issues with that one, because of need to memorize a lot of SRND recommendations to do it right. The good news is that during the lab exam you have full access to the QoS SRND documents and UniverCD content. The bad news is that you won’t probably have enough time to navigate the UniverCD with comfort plus the reference configurations often have a lot of typos and mistakes in them. Read More
Jan
26
To begin with, why whould anyone need to run Multilink PPP (MLPPP or MLP) with Interleaving over Frame-Relay? Well, back in days, when Frame-Relay and ATM were really popular, there was a need to interwork the two technologies: that is, transparently pass encapsulated packets between FR and ATM PVCs. (This is similar in concept with modern L2 VPN interworking, however it was specific to ATM and Frame-Relay). Let's imagine a situation where we have slow ATM and Frame-Relay links, used to... Read More

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