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afterthenumber

Thoughts and experiences of a Cisco Collaboration engineer after clearing the CCIE lab…

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    Category: CUBE

    Interpreting MGCP Debug Parameters

    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”

    2016-05-192016-05-19 by jonathan

    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”

    2016-05-192016-05-19 by jonathan

    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”

    2016-05-152017-04-13 by jonathan

    ISR G2 PVDM3 Video Conferencing Deprecated

    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”

    2016-03-232016-03-23 by jonathan

    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”

    2016-03-182016-03-18 by jonathan

    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”

    2016-03-172016-03-23 by jonathan

    Implementing Loop Prevention on CUBE

    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”

    2015-12-072016-03-18 by jonathan

    SIP SRST Dialling Fails Due to Header Addressing – CSCur95578

    Haven’t been able to post in a while as my current project is keeping me very busy! As the core multi-cluster deployment is now complete, we’ve moved on… Read more “SIP SRST Dialling Fails Due to Header Addressing – CSCur95578”

    2015-11-012016-05-20 by jonathan

    Forcing MTP Killed the Mid-Call

    There’s a common misconception with Cisco SIP trunking that the desperate “Forced MTP” will always solve no audio, one-way audio, DTMF inter-working and every other media negotiation… Read more “Forcing MTP Killed the Mid-Call”

    2015-08-082016-03-23 by jonathan
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