Tag: CUCM

I had a licensing overage I couldn’t explain, so I asked AI to investigate.

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 asked Claude Code to check every phone's Owner User ID field against who actually controls the device — the controlled-device association in CUCM.

A minute later it came back with 13 mismatches.

10 phones had a blank Owner User ID. A real user still had the device listed as their controlled device, but the owner field was just… empty.

3 more had their previous owners still listed — people who'd left the company. The phones had been reassigned, someone updated the controlled device list, but nobody went back and changed the Owner User ID.

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    Continue reading I had a licensing overage I couldn’t explain, so I asked AI to investigate.

    Cisco SIP Gateway configuration: The Ultimate Guide

    Connecting the Cisco IOS Voice Gateway to CUCM via SIP has been the preferred way to do it in the past couple of years.

    The slowly dying H323 protocol (ISDN based) is not being developed anymore while SIP (HTTP based) became the industry standard for VoIP. So whenever PSTN connection is implemented via an IOS Voice Gateway, the choice should be really between SIP & MGCP.

    This is how it’s done, step by step, using SIP.

    Continue reading Cisco SIP Gateway configuration: The Ultimate Guide

    CUCM SIP Call Flow Troubleshooting

    SIP Call FlowThere is no way around it,
    finding the SIP call flow is the first thing you have to do when you are facing a SIP call failure.

    Why?
    Easy.
    Because first of all, you have to understand whether this is a call routing problem or signaling/media compatibility issue.
    SIP call flow helps you understand just that, and in a lot of cases, you can pinpoint the problem just from looking at the SIP call flow.

    Continue reading CUCM SIP Call Flow Troubleshooting