SRST maximum on CUCM

Answered Question
May 4th, 2010
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I cannot find anything that tells me if there is a maximum number of gateways allowed to hang off CUCM, does anyone know if there is a maximum? We currently have 4 sites that are SRST enabled and we may have 2-3 more in the near future and I want to make sure we are not reaching a capacity issue or crash our CUCM, we are currently running 6.1.2 and plan to migrate to 6.1.3 then 7.1.3 soon.


Thanks.


John

Correct Answer by David Hailey about 7 years 2 months ago

So, your question is about is there a limit to the number of gateways you can register to CUCM? OR is your question more along the lines of is there a limit to the number of SRST-enabled users across the cumulative count of gateways in my environment?


For the first, I don’t know of a set limit of gateways. I have built CUCM clusters for school systems where every school has a single or even two gateways in addition to centralized gateways - so well over a 100 gateways configured without issue. If there is a hard limit, I am not aware of one.


As for the second, SRST maximum is not cumulative across devices. It is per device and is based on hardware, SRST version, and what you're licensed for. For example, a 3845 can support more SRST users than a 2801 but the 2 are independent of each other because once the devices are in SRST mode, they lose connection to CUCM (as you already know) and would have no direct IP / call setup path between them. They operate independently until the CUCM comes back online.


Hailey


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Correct Answer
David Hailey Tue, 05/04/2010 - 07:29
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So, your question is about is there a limit to the number of gateways you can register to CUCM? OR is your question more along the lines of is there a limit to the number of SRST-enabled users across the cumulative count of gateways in my environment?


For the first, I don’t know of a set limit of gateways. I have built CUCM clusters for school systems where every school has a single or even two gateways in addition to centralized gateways - so well over a 100 gateways configured without issue. If there is a hard limit, I am not aware of one.


As for the second, SRST maximum is not cumulative across devices. It is per device and is based on hardware, SRST version, and what you're licensed for. For example, a 3845 can support more SRST users than a 2801 but the 2 are independent of each other because once the devices are in SRST mode, they lose connection to CUCM (as you already know) and would have no direct IP / call setup path between them. They operate independently until the CUCM comes back online.


Hailey


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j.mccartney Wed, 05/05/2010 - 08:22
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Thanks for your response David. My question was more targeted at if CUCM had a limit as to the number of SRST gateways it would allow which you answered. I have some sites which utilize 2901's and one that has a 881W (which I have to upgrade IOS on due to a bug).


Thanks again!


John

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