But we're not using CME. We use call Manager on MCS7825 server. And the router running IOS: Cisco IOS Software, 2800 Software (C2800NM-SPSERVICESK9-M), Version 12.4(3h), RELEASE SOFTWARE (fc2).(c2800nm-spservicesk9-mz.124-3h.bin).
I afraid CallManager can support but Gateway Router can not support.
Because you have CallManager running on the server, the router only serves one primary purpose and that is as a voice gateway. As such, it doesn't matter how many phones on the network, but how many PSTN lines need to be supported. If you are not adding more PSTN lines, then the router will be fine.
Now, it sounds like you have a total of 5 E1 lines, so you are already supporting up to 155 voice channels. I certainly hope that is enough for you 100 users!!!
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