[cisco-voip] Design question--- More phones, do I need more Call Managers or not?

[Lelio Fulgenzi]

Depending on your servers, you are correct, I doubt you need another subscriber. Here's a snippet from 4.0 SRND , the table column has users but I'm pretty sure as the table title says, it's devices. The server datasheets seem to support this. 

  Table 8-2 Maximum Number of Devices per Server Platform  
   Server Platform Characteristics  Maximum Users per Server1  High-Availability Server2  High-Performance Server  
      Cisco MCS-7845 (All models) 
     7500 
     Yes 
     Yes 
     
      Cisco MCS-7835 (All models) 
     2500 
     Yes 
     No 
     
      Cisco MCS-7825 (All models) 
     1000 
     No 
     No 
     
      Cisco MCS-7815 (All models)3 
     300 
     No 
     No 
     


As for SRST, I don't have any experience, but from what I understand, it's version and platform dependent. The SRST Q&A page talks specifically about this, I've cut and paste some cells. Looks like for your 90+50=140 phones you will need a minimum of a 3725, but that might be cutting it close with no room to expand.

      Table 2. Supported Platforms, Maximum Phones/Directory Numbers, and Memory Requirements 
        SRST 2.0 SRST 2.1 SRST 3.0 SRST 3.1 SRST 3.2/3.2.1   
      Platform Phones/DN Phones/DN Phones/DN Phones/DN Phones/DN Recommended Memory (Flash/DRAM) 
      1760, 1760-V 24/96 24/120 24/120 24/120 24/120 32/128 
      265x 24/96 24/96 24/96 N/A N/A 32/96 
      261xXM, 262xXM 24/96 24/120 24/120 36/144 36/144 48/128 
      3725 144/432 144/576 144/576 144/576 144/576 32/128 
      3745 240/720 240/960 240/960 240/960 480/960 32/128 
      3825 N/A N/A N/A N/A 336/960 64/256 
      3845 N/A N/A N/A N/A 720/960 64/256 


  ----- Original Message ----- 
  From: Tim Reimers 
  To: cisco-voip at puck.nether.net 
  Sent: Wednesday, November 16, 2005 9:25 PM
  Subject: [cisco-voip] Design question--- More phones,do I need more Call Managers or not?


  Hi everyone-

   

  I have a general design question for you all - looking for input on what you think-

   

  System stats:

  School district phone system-

  7 schools, one Central Office

   

   

  Currently, we run 460 phones at 8 sites- all over Gigabit fiber with a 6509 at the core at the Central Office.

   

  Mostly 7905 phones, with about 150 7960 phones

  Two 4.0 Call Managers- publisher, subscriber

  Unity 4.0

  Cisco Emergency Responder

  Two ISDN PRIs, running 30 channels out of the available 47, handled by a 2651XM with the PRI NM module.

  8 sites at this time.

  Each site has a 1760 (one 2651 at the middle school) router that runs SRST and handles emergency calls.

  Each router has 2 POTS lines attached, for two calls outside the system when the link to the CO is down or a 911 call needs to go out from the address of the school.

  Voice switches are 3560-24/48-PS switches - they also terminate the data traffic going back onto the fiber to the Central Office.

  Most schools have only one voice switch per wiring closet, up to 4 switches per school

   

   

  We're getting ready to add on the high school now- it is 90 or so classroom phones, and probably about 50 or so 'office' 7960 phones.

   

  I anticipate needing to turn on the other channels in the PRI..

   

  So--- having laid out what we have, let me ask a few questions-

   

  the major question is this-

   

  The vendor who put in the system and is a bidder on the highschool addition wants to put in a third call manager 

  I recall that the CCM is capable of up to 2500 phones--- so I doubt that with about 700 phones we're anywhere near stressing the system.

  I don't know how many phones SRST supports nowadays--- I think I recall 25 phones.

  That's about all I can think of that would justify a whole third CCM installation for only 150 or so phones.if you wanted more than 25 phones up and running in SRST mode.

   

  Anyone got any ideas on design for the highschool?

  There's going to be a 4006 at the core, but not running voice - that'll be separate switches in that building, and all other buildings.3560 switches I'd imagine.

   

  Thanks for any input you guys can offer!

   

  Tim



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