Had an issue that’s affected multiple deployments that I’ve been working on. At one of my clients in particular, this reached an escalation level. Just sharing this… Read more “CSCug20588 – Auto-Reg Failure – “Could not insert new row – duplicate value in a UN””
Tag: SIP
Cisco Meraki Managed Communciations MC74 IP Phone Released
Cisco Meraki have released a new cloud-managed phone. Gotta say I love the look of the elegant slim-line design. The key to this deployment model’s appeal can… Read more “Cisco Meraki Managed Communciations MC74 IP Phone Released”
CUBE URI-based Routing and Multiple Via Headers
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”
CUCM Video Codec Preferences Support – CSCuw53802
Colleague called me for assistance with a video call that wouldn’t set up when dialling in to a VC bridge. The call flow was from a Polycom… Read more “CUCM Video Codec Preferences Support – CSCuw53802”
VoIP Bandwidth Calculations
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”
RFC 5411 – And Other Guides to the SIP Galaxy
Given half a chance, I am always open to punt The SIP School as probably the best starting point for learning SIP out there. I took this course some… Read more “RFC 5411 – And Other Guides to the SIP Galaxy”
CUBE SIP Profiles – Normalizing Incorrect RURI/To Headers using Diversion
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”
Incorrect SIP Realm – CUBE Not Responding to 401 Unauthorized
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”
ExpressWay DMZ and NAT Design Considerations
There are a number of excellent documents on the subject of ExpressWay traversal DMZ design and handling NAT. I must however commend Cisco on the updates on… Read more “ExpressWay DMZ and NAT Design Considerations”
