Expanding my CME

Unanswered Question
Nov 9th, 2007

I found out that i need more than 48 phones in my network. Do i need to buy a new IP PBX 2821 or can i upgrade the device to support more phones?

I have this problem too.
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rob.huffman Fri, 11/09/2007 - 07:58

Hi Walid,

The number of supported phones is based on the Router platform and Memory (like you have correctly noted). You will need to purchase a new box :(

For example: Here is the number for a 2811,2821 and 2851 with CME;

Cisco 2811

Maximum Total IP Phones 36

Cisco 2821

Maximum Total IP Phones 48

Cisco 2851

Maximum Total IP Phones 96

From this good CME doc;

http://www.cisco.com/en/US/products/sw/voicesw/ps4625/prod_installation_guide09186a00807aae21.html

Hope this helps!

Rob

Paolo Bevilacqua Fri, 11/09/2007 - 08:06

Rob gave the official numbers.

Here the actual ones, that are larger because Cisco in their grace, gave customers a little of slack:

SCCP SCCP SIP SIP

Phones DNs Phones DNs

1751 (CME 3.2) 30 150 100 N/A

2801 30 150 24 144

2811 42 144 36 144

2821 ?? ?? ??

2851 96 288 96 288

3825 168 500

3845 240 700

Paolo Bevilacqua Fri, 11/09/2007 - 07:59

You cannot increase the limit for ephones on a router and no upgrades are available.

However, if you can live with the differences and limitations, you could add an equivalent number of ephones, because the software does not enforce the sum of SCCP and SIP phones against the maximum supported.

That would be a unsupported configuration, of course.

Hope this helps, please rate post if it does!

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