Thoughts and experiences of a Cisco Collaboration engineer after clearing the CCIE lab…
Overview I’ve recently written a Tcl script using Cisco’s Tcl IVR Voice Gateway API. The script provides Time of Day routing. It offers the ability for streaming audio… Read more “IOS-based Tcl IVR Solution for Pre-Call Media and Business-Hours Schedule Announcements”
Cisco licensing is as best a mild irritation, but in reality, an impossibly poor, yet growing set of ill-conceived disparate implementations. IOS-XE and IOS v15.x licensing is… Read more “Uncovering IOS 15.x and IOS-XE Licensing for the Uninitiated”
Overview Recently had a customer which wanted to connect to a public ITSP (Flowroute). Their network design required a dual-interface CUBE deployment model, with an “inside” private… Read more “Supporting CUBE NAT Integrations without Firewall ALG”
I manage a number of deployments that still feature ISDN extensively, so debug mgcp packet is something that I’m reading off IOS CLI on a fairly routine basis at… Read more “Interpreting MGCP Debug Parameters”
Cisco introduced some pretty cool URI enhancements for CUBE from 15.4(1)T that have added some great extensions to the CUBE feature set, and specifically include some fine-grained SIP routing… Read more “CUBE URI-based Routing and Multiple Via Headers”
If you’re preparing for a your CCIE Written or Lab exams, or (far more importantly) if you need to perform bandwidth sizing for a VoIP design or… Read more “VoIP Bandwidth Calculations”
If you are in the process of preparing for the CCIE lab, you will be interested and very happy to see this! A terrible “feature” finally put… Read more “ISR G2 PVDM3 Video Conferencing Deprecated”
Had a strange requirement today. Needed to replicate a behaviour that is apparently quiet common on Asterisk, but haven’t seen it before myself. Our ITSP implemented a… Read more “CUBE SIP Profiles – Normalizing Incorrect RURI/To Headers using Diversion”
Had an issue today where we had to migrate a client as our ITSP migrated the client to a different SBC platforms. After re-pointing, the SIP Trunk was failing… Read more “Incorrect SIP Realm – CUBE Not Responding to 401 Unauthorized”
We work quite a lot with a single ITSP in our smaller deployments, but keep hitting a problem with number porting. We’re repeatedly facing a problem whereby… Read more “Implementing Loop Prevention on CUBE”
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