UC Corner

I'm a customer support engineer that supporting Cisco Unified Communication products. I built this blog and wrote the book " Deploy...

When installing Cisco Unified Communication products (CUCM, CUPS, CER, UC, CUMA, etc.), you might get a message saying that the hardware is ...

Licensing is another mysterious area in Unified Communication. Each product has its own licensing model. CUCM (CallManager) CUCM license re...

Cisco is going to change the CCIE Voice Lab in mid-July 2009. Major changes are: 1) Remove analog devices (such as VG248, ATA) 2) Remove Cat...

On Cisco Unified Communication products, there's a terminology called "Change Notification". What is "Change Notification...

Phone reset issue is the most common yet most nasty issue (especially when it's "sporadic" or "intermittent"). Pleas...

Most IT guys would know about KISS rule (Keep It Simple Stupid). However, not too many really understand and utilize it. Let's take a lo...