UC Corner

Network and UC engineers often need a SFTP server.  I've been using FreeFTPd for years due to it's small size and free.  However Fre...

With may vendors going virtualization, it is possible to run virtual labs where it requires physical equipment before(such as Cisco ISR rout...

SIP has become dominant in UC(Unified Communications) now.  If you're interested in learning/practicing SIP, CUBE, SBC, etc., here are s...

When deploying a Cisco Expressway MRA(Mobile Remote Access) solution, I ran into a weird interoperability issue with AT&T wireless.  The...

Software used: GNS3 2.2.17 VMware Workstation for Windows 16.1.0 Windows 10 x64 Version 20H2 (Build 19042.685) Cisco CSR 1000v (csr1000v-uni...

CUCM Security Tips With CUCM in non-secure (default) mode, you may use secure SIP trunk, but you cannot use secure SCCP endpoints (secure me...

Cisco CUCM (CallManager) has "urgent priority" option for translation patterns and route patterns.  At the first glance, it is pre...