Secure signaling and Media exchange Part I Introduction This first part, of a two part post, I will describe the technology behind secure signalling and media exchange in a Cisco Unified Call Manager deployment. It will describe how secure signalling and media exchange between phones, Call Manager and an H323 gateway, works. In part II, I will describe the configuration steps required to pull all this off. A lot of UC engineers might never come…

Viewing Core dumps CUCM Core dumps, ah yes!  The boring stuff. Some times an  unavoidable part of a troubleshooting process. they can be particularly useful if you see certain services restart on your server for no apparent reason. This is a quick little post on how to obtain core dumps and how to capture their output and what to look for once you have the output. What are they? Core dumps occur when a Linux process…

Call recording configuration in CUCM Call recording.  This boils down to capturing RTP streams and somehow matching a certain RTP stream to an extension and or user ID, so it can be archived properly on a recording server. In order to do this, two things will need to be in place: Some form of RTP stream replication/forking, so that a conversation can take place as well as a recording of this same conversation at the…

Automatic Call recording using DMS and Verint In this post I want to show how to set up call recording in CUCM, using DMS in conjunction with, for instance, Verint.  But before I do this I want to dig into the theory behind this setup.   DMS stands for Dual Media Streaming. Call recording solutions that use DMS, make use of a phone’s ability to fork an incoming call, to a second destination, such as…

CUCM Database replication, how it works CUCM Database replication, how it works, or how it doesn’t. And when it doesn’t, the shit has hit the fan.  I am really hoping that this particular post will expand an improve, because there is very little information available about the internals of the various UC platforms.  That is probably Cisco’s way of trying to hide the fact that there is not much Cisco technology behind those platforms, but…

Cisco Real time Monitoring Tool (RTMT) Alerts and email notification Writing this post because I was working on customizing alerts that can be generated by Cisco’s Real Time Monitoring Tool. RTMT is by far the easiest tool for for performance monitoring and alert generation, on either CUCM, CUC as well as CUPS. So Lets get cracking.   The start off point for most people, when using RTMT, is the alert central (See below) Fig. 1…

Directed Call Park, as an alternative for transfers on an analog phones Well this is going to be an easy a short post.    I am quite convinced, there are quite a few people around that have analog phones deployed in a, for the rest, all out IP phone deployment.  I have seen this a number of times, analog phones on FXS ports (MGCP, SCCP or H323) and I have also seen issues with transfers…