I was looking at licensing numbers on a CUCM cluster last week and something didn't add up. More device licenses consumed than users who should have them. Not a huge gap — but enough to make me dig. So I…
SIP 100 Trying response code is part of the 1XX SIP Response Codes and one of the most commonly used SIP response codes in the SIP stack. SIP works on a request-response model and 1xx SIP response codes are there…
SIP 404 Not Found response belongs to the 4xx SIP code group.A group of SIP codes that indicate a request failure and constitutes a number of codes used by SIP for communicating errors and failures. In this blog post we…
Cisco CUBE HA is becoming more prevalent with the CSR1000 or vCUBE, therefore with its popularity, learning how to configure Cisco CUBE HA has become an essential skill that UC engineers should have.
Cisco SIP SRST Configuration is the process of providing backup to external SIP Call control (IP-PBX) through the provision of the basic registrar and re-direct server or back-to-back user agent (B2BUA) services.
Step by step guide to configuring options Ping on CUBE. Learning how to busy out a dial-peer when a SIP trunk goes down. SIP Options Ping on CUBE.
Troubleshooting VoIP issues can be troublesome. When something goes wrong, the lack of direct visibility as to what is occurring on the network with SIP and RTP packets can initially be intimidating to network and voice engineers. However, Wireshark SIP…
When there’s trouble in the network, and voice services are suffering, those in need will call upon you, the networking superhero! As a superhero, you use your x-ray vision to zoom in to the microscopic world of voice packets, to…
When I encounter a problem on a VoIP network that needs troubleshooting, I just wish that I had microscopic X-ray vision, like a superhero who is able to peer into the subatomic level of things. It would be so advantageous…
You get a call from a user stating that they have experienced poor voice quality issues with their Cisco IP phone.Your mind goes numb, your palms get sweaty, and your eyes glaze over. What do you do? Where do you…