Deploying Unified Communications Manager to geographically diverse sites adds a number of challenges not experienced in single-site deployments. The primary new challenges are: Bandwidth usage and call quality over WAN links Availability during WAN outages Call routing to the PSTN, … Continue reading
Mobile Connect is Cisco’s trade name for what is often called Single Number Reach, or SNR. It extends a call to a user’s desk phone out to up to ten other phones, such as home and cell phones. This allows … Continue reading
Over the last several years, we have seen a large push towards MPLS from carriers, and it has been added to the topics for the CCIE R/S. When I started studying MPLS, I had a bit of trouble wrapping my … Continue reading
Switched Port Analyzer (SPAN) is a means of redirecting traffic from one switch port to another for analysis. An example would be capturing the traffic to a host with a PC running a program like Wireshark. Setting up SPAN is … Continue reading
Cisco Unified Communications Manager allows for very granular assignment of permissions, using the concept of roles and groups to assign specific permissions to users. A role is a list of permissions around a function, and a group is a list … Continue reading
When reading debugs, I often use a page or so of blank prompts to separate various things (VoIP calls, etc.) by hitting enter a bunch of times. You can also add comments to the break by prefixing them with an exclamation point. … Continue reading
To convert DSCP AF values to decimal, multiply the first digit by 8, and the second digit by 2, and add the two values: AF21 – (2*8) + (1*2) = 18 AF31 – (3*8) + (1*2) = 26 The process … Continue reading
I ran into some issues with Exchange running through Zone-based firewalls, where the servers would not pass mail between them. This appears to be related to SMTP inspection rejecting the ESMTP commands Exchange uses. The problem can be resolved by … Continue reading