r/ciscoUC

CCNP Collab certified. 15 years experience in anything UC and Webex Calling and Contact Center. US citizen. Preferred remote but can work on Hybrid settings. If you can help pls DM me. Thanks in advance

We have bought some cisco 9841s to use on our on prem CUCM v15. I noticed in the documentation that this model of phone has a anti spam feature. I seem to be not able to add this feature to the phone. Is this feature only for Webex calling as when you boot the phone up you can select either webex or CUCM. Has any one been successful at adding the anti spam feature on these models to on prem.

We have an issue where certain calls randomly end up having static or garbled audio in them randomly during the ca.

We are on onPrem CUCM and Cisco Cube and I wanted to ask how we should go about figuring out what's happening.

CUCM SDL logs have no information about call metrics and I don't think we can just leave debug and pcap running on CUBE 24x7 given that this is happening randomly.

Any suggestions that folks here might have on this?

Webex MT.
9861 phones

Full rant.

Now I can't get the barge feature to work.
The docs say it's a supported feature on the 9800 phones and I want to use it.
Privacy is turned off and Barge in is enabled for all sets involved.

I suspect it's related to another issue I have where I can't join two calls on my phone together.

It seems to take days to get a response back from tech support. These issues could actually hold up cutting my enterprise over.

I would love for someone to say "You're an idiot. Just change setting X and you're good to go." But I feel like the features Webex says is supported haven't been fully tested. Perhaps that's why I exist, to be a beta tester for them. If that's the case, I don't ever want to talk to Sherlock again.

Trying to understand high level cost difference between the two for 4000 users with about 1600 analog and 2400 ip phones.

Hello,

I am trying to setup a few MRA phones for remote users. Also trying to make sure they can call 911 and have the PSAP see their home address for the emergency dispatch. Currently when they call 911, PSAP sees the main site address through the matching of ERL.

My question is:

1. If I add those individual MRA phones in CER using their MAC and create their own ERL/ELIN with their home address. How would the PSAP get their home address? Would I need to provide the ERL list to telco?
2. If I assign them the ELIN other than their DN, what configuration do I need to make in CUCM? I have a CTI Route point with 913XXXXXXXXXX number already present in CUCM. When I call the ELIN from my cell phone call fails.

Thanks

Hello everyone!
Weird problem here.

I had to rebuild my Exp-C and E a few weeks ago, and updated it to 15.5 and everything was working well. I'm running CUCM/CUP/UC 15 SU1

But today, i had a power outage and when restarting, everything went well, except for Jabber clients not able to login.

I'm using only collab-edge login, and my Exp-E is presenting a valid and fresh Let's Encrypt cert.

When I try to login, these are the logs shown:

• On E:traffic_server[8380]: Event="Sending HTTP error response" Status="401" Reason="Unauthorized" Dst-ip="172.17.10.175" Dst-port="59078" UTCTime="2026-05-02 15:36:13,618"
• on C:edgeconfigprovisioning: Level="WARN" Service="ECS" Detail="Request failed" User="('username', 'XXX@domain.com')" Issue="Unable to determine home CUCM" Reason="UDS not available" TrackingID="57259926-aae8-48d8-8842-13d1e8a66576" UTCTime="2026-05-02 15:36:13,604"edgeconfigprovisioning: Level="WARN" Service="ECS" Detail="Request failed" User="('username', 'XXX')" Issue="Unable to determine home CUCM" Reason="UDS not available" TrackingID="4642a015-686d-4944-a0da-9f4c6c810b07" UTCTime="2026-05-02 15:36:13,547"

UDS DNS record doesn't exist. I am in a scenario where all Jabber clients connect via collab-edge, like in universities.

I tried to check my AD connection (login to Self Service with AD users works), checked in CUCM End users pane and their home cluster is still checked, etc. Everything seems to be there.

If someone has an idea, i would gladly appreciate it!

Thank you much!

Edit: The thing solved itself. I'm kind of embarrassed because I did reboot the Expressways just after experiencing the problem, and after no config change, a second reboot solved everything... Thank you to everyone, I have been checking every suggested parameter at least! :)

Working on a V15 cluster. We have 3 sites and specific nodes have TFTP enabled, as well as specific nodes have Call Processing enabled. How does MRA decide which nodes to connect to for these services? Based on what I'm seeing in the logs it's essentially random. Out of 7 nodes only 3 have TFTP, and it tries them all until it gets a response. Slows down MRA registration. Is there any way to specify which nodes host which services in MRA?

Hello,

From what I understand it is not possible to SIP dial a group. A phone number must be used.

I'm surprised that users have an SIP address but not groups.

Can someone explain why that is ?

Thank you

I need some help on this. (two different AIs have been wrong.)
I have a 9861 on WxC.
I have one active call and one call on hold.
Now I want to merge them.
There doesn't seem to be a way to do that, at least on a 9861.
Even my support vendor says there should be a "join" option.
There isn't.
If there's an option in the Control Hub, I haven't been able to find it.

Does anyone have any suggestions?