[cisco-voip] 7960 talking to two separate call manager systems

[Lelio Fulgenzi]

We have three clusters working on the same network and have not run into any problems. (Thank goodness). We do, however, only have one DHCP server running which tells phones by default to point to a particular TFTP server depending on the network the phone is on. By modifying option 32 on the phone to yes and then option 8 to the appropriate TFTP server, things have worked tickety-boo. 
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Lelio Fulgenzi, B.A.                                  lelio at uoguelph.ca.eh
Network Analyst (CCS)
University of Guelph                             FAX:(519) 767-1060 JNHN
Guelph, Ontario N1G 2W1                          TEL:(519) 824-4120 x56354
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
mob lawyer: your people insulted my brother.
dr. house: what? romano in the parmesan cheese shaker again?
  ----- Original Message ----- 
  From: Paul Yago 
  To: Cisco VoIP Users List 
  Sent: Wednesday, July 06, 2005 6:06 PM
  Subject: RE: [cisco-voip] 7960 talking to two separate call manager systems


  My understanding is that CCM clusters should not co-exist on the same network and therefore multiple lines from different clusters is not a supported feature of the phones. We have this problem in our small enterprise, where there is one network segment and 2 (sometimes 3) CCM clusters, and one DHCP server with the TFTP option enable for only one of the CCMs. 

   

  In order to switch CCMs, I just have everyone switch the TFTP settings on the phone as suggested below. But sometimes even this doesn't work. The Device information is cached in the phones and even when I erase the configuration, disable DHCP, and modify the TFTP setting, the phone will connect to the wrong CCM. Only by temporarily disabling the TFTP service on the wrong CCM, am I able to connect to the right one.

   

  Anyway, I hope this helps a bit. Good luck.

   

  Paul

   


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  From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Lelio Fulgenzi
  Sent: Wednesday, July 06, 2005 2:23 PM
  To: Cisco VoIP Users List
  Subject: Re: [cisco-voip] 7960 talking to two separate call manager systems

   

  Do you mean at the same time or at different times? If you need at different times, than yes, you can use alternate TFTP settings for this. If you need them at the same time, than I'm pretty sure you cant. If you need a phone with a lines from different CallManagers, I would suggest getting a business style analog set with multiple line support (some support up to 8) and plug these into FXS ports on the different CallManagers.

   

  -----                                                                -----
  Lelio Fulgenzi, B.A.                                  lelio at uoguelph.ca.eh
  Network Analyst (CCS)
  University of Guelph                             FAX:(519) 767-1060 JNHN
  Guelph, Ontario N1G 2W1                          TEL:(519) 824-4120 x56354
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  mob lawyer: your people insulted my brother.
  dr. house: what? romano in the parmesan cheese shaker again?

    ----- Original Message ----- 

    From: Eric S. Johnson 

    To: cisco-voip at puck.nether.net 

    Sent: Wednesday, July 06, 2005 5:05 PM

    Subject: [cisco-voip] 7960 talking to two separate call manager systems

     

    Hi,

    >From my quick perusal of the docs it seems this is probably impossible
    but I will throw out the question to see if I have missed something:

    Can a single 7960 phone talk to two separate call managers and 
    present two lines, one from each system?  Not two CM's backing each other
    up, but two distinct call manager systems? 

    If so how do I work this magic?

    Thanks for any pointers
    E

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