Two CCME Routera at a single location

Unanswered Question
Apr 28th, 2010

Hi all,

Am trying to propose a CCME solution with two callmanagers at a site as shown in the attached diagram. I understand it can work perfectlly with an enterprise solution ( Cisco Callmanager Server) but i am price conciuos here. I want to know if this slution is feasible and the likely consequenncies after implementing it.

I will appreciate your responses.

I have this problem too.
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Overall Rating: 3 (3 ratings)
Walter Solano Wed, 05/05/2010 - 13:34

Hello Peter,

You can use two CMEs at the same location, but the configuation will be more difficult because you have to configure dial-peers to communicate between the CMEs, also the voice mail (CUE) will be split so some agents will have voice mail in one device and other ones in the second router. One of the major issues will be the lack of redundancy because CME in a 3845 can have up to 250 IP Phones.


Walter Solano

CCNA Voice

Cisco UCCX Specialist

Walter Solano Wed, 05/05/2010 - 13:53

100% Agreed, I have been seen so many extrange issues with this kind of deployments, as

I said it can be done but its very hard to get it working properly.

Walter Solano

CCNA Voice

Cisco UCCX Specialist

Paolo Bevilacqua Wed, 05/05/2010 - 13:44

I do not recommend this solution as typically is source of trouble and confusion.

If 450 phones is enough for you, get a 3945-E. Otherwise, get CM.

Big companies cannot expect to spend like they were small.

peternnaji Thu, 05/06/2010 - 03:13

Thanks for your response. Am aware that all voice routers do cme. But does the router 3945-E come already bundled with the CME software embeded on it? Or do I need to download and install the software on the router?

What's the max number of IP Phones this can accommodate?

Paolo Bevilacqua Thu, 05/06/2010 - 03:38

Sorry I have noticed unfair rating in this thread.

In the future I will make sure to avoid interacting again, so good luck.

peternnaji Thu, 05/06/2010 - 23:51

Hi Bevilacqua

I appreciate you contribution thus far. Am so sorry about the unfair rating (according to you). But i've not been answerred completely.

I am aware that the max number of IP Phones for a cme router is 250. All I wanted to know is if I can use a single router (the 3945-E) as a cme to accommodate up to 450 IP Phones as you state. If so how do I achieve it. Please dont get angry with me. Am only trying to learn more.

Thank you!

Paolo Bevilacqua Fri, 05/07/2010 - 03:39

I have already replied above with a link, have you read it ?

If it is not you leaving inappropriate rating, you can always go back and rate posts to compensate.

grundle1322 Fri, 05/07/2010 - 13:21

I also agree with the need for a CUCM and not CUCME, but this discussion has brought out another question pertaining to his needs.  If you did go with a 3945E with 450 phones you would need 2 NME-CUE modules due to each module only supporting 275 mailboxes.  Is it possible to run 2 CUE on the same router with the same CUCME deployment?

I think it would be fairly easy to get voicemails into the mailboxes (cfna set to the respective voicemail pilot for the each CUE), but if my memory serves me correctly the hunt pilot config on the CUCME is a global config which only supports 1 pilot number.  If that pilot number is set to CUE #1, then how would phones tied to CUE #2 retrieve their messages shy of dialing the pilot number manually and then manually signing into CUE?

Paolo Bevilacqua Fri, 05/07/2010 - 14:14

When bought in SRE version (SM-SRE-700-K9) CUE supports up to 500 mailboxes. That will be available with software 8.0

In most cases, having 450 extensions does not mean 450 VM boxes, because typically many extensions do not need one.

If needed, it's easy to setup a translation rule so that in system where boxes are split across two CUE, the correct access number is always reached.

grundle1322 Fri, 05/07/2010 - 14:18

Thanks for the reply.  You cleared up the debate here at the office.  +5 for the great answer and timely response.


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