[cisco-voip] Bandwidth Requirements between CUCM Cluster and distributed Unity Connection

[Keith Allan]

Peter,

Many thanks for your information.  The mail server is also located on
the same remote site as the Unity Connection. No voice or voicemail will
traverse the WAN only call control.

Thanks again.

Keith.

-----Original Message-----
From: Peter Slow [mailto:peter.slow at gmail.com] 
Sent: 08 February 2010 21:23
To: Keith Allan
Cc: Matthew Saskin; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Bandwidth Requirements between CUCM Cluster
and distributed Unity Connection

BTW:

..."To calculate call control bandwidth requirements in these cases,
use the following formulas, which contain an additional variable (CH)
that represents the average calls per hour per phone:

Equation 3A: Recommended Bandwidth Needed for SCCP Control Traffic for
a Branch with No Signaling Encryption.

Bandwidth (bps) = (53 + 21 * CH) * (Number of IP phones and gateways
in the branch)"

...From the CUCM 7.x SRND just after Table 3-12

-Peter



On Mon, Feb 8, 2010 at 4:18 PM, Peter Slow <peter.slow at gmail.com> wrote:
> (to clarify, the QoS for the VM port signaling is your primary concern
> because it's the only thing consistently  going across the WAN. You
> still need to keep QoS in mind for messages being played back towards
> users listening to their VM across the WAN in the event that there are
> users in that scenario. You should still keep LAN QoS in mind at the
> local site as it can still save you in the event of something like a
> switching loop or other type of localized traffic storm.)
>
> On Mon, Feb 8, 2010 at 4:15 PM, Peter Slow <peter.slow at gmail.com>
wrote:
>> Keith,
>>
>>> Thank you for your comments.  The reason for Unity Connection being
located
>>> on a remote site is because the gateway is also located on the same
site and
>>
>> that's intelligent placement of your unity server.
>>
>>> the bandwidth between the sites is limited.  I did see a comment
once
>>> stating we should treat each voicemail port as a phone and allow the
>>> appropriate QOS across the WAN.
>>
>> ...Correct, this should be your primary concern. The only other thing
>> I'd be concerned about is, in the event that you have Connection
>> forwarding any messages to your user's mailboxes, where is the mail
>> server located? if you aren't doing that then it won't be an issue.
>>
>> -Peter
>>
>>
>>
>>
>> On Mon, Feb 8, 2010 at 10:25 AM, Keith Allan <Keith.Allan at 5i.co.uk>
wrote:
>>> Mathew,
>>>
>>>
>>>
>>> Thank you for your comments.  The reason for Unity Connection being
located
>>> on a remote site is because the gateway is also located on the same
site and
>>> the bandwidth between the sites is limited.  I did see a comment
once
>>> stating we should treat each voicemail port as a phone and allow the
>>> appropriate QOS across the WAN.
>>>
>>>
>>>
>>> Thanks again.
>>>
>>>
>>>
>>> Keith.
>>>
>>>
>>>
>>> From: Matthew Saskin [mailto:msaskin at gmail.com]
>>> Sent: 08 February 2010 15:18
>>> To: Keith Allan
>>> Cc: cisco-voip at puck.nether.net
>>> Subject: Re: [cisco-voip] Bandwidth Requirements between CUCM
Cluster and
>>> distributed Unity Connection
>>>
>>>
>>>
>>> Keith -
>>>
>>>
>>>
>>> I don't think there are any specific requirements, primarily because
of how
>>> unity works.  Essentially, Unity is represented to CallManager by
the
>>> voicemail ports, which are just SCCP devices (or a SIP trunk,
depending).
>>> The bigger concern (depending on your topology) is not the distance
from
>>> CallManager to Unity, but the distance from the ingress voice
gateways or
>>> originating IP phone to unity as that's where the voice stream is.
>>>
>>> Matthew Saskin
>>> msaskin at gmail.com
>>> 203-253-9571
>>>
>>> July 18, 2010 - 1500m swim (in the hudson), 40k bike, 10k run
>>> Please support the Leukemia & Lyphoma Society
>>> http://pages.teamintraining.org/nyc/nyctri10/msaskin
>>>
>>> On Sun, Feb 7, 2010 at 2:31 PM, Keith Allan <Keith.Allan at 5i.co.uk>
wrote:
>>>
>>> Hi,  We have a centralised CUCM cluster and need to install Unity
Connection
>>> on a remote site. The design guides show this is supported but I
can't find
>>> any minimum bandwidth requirements for the WAN between CUCM and UCN
other
>>> than the standard min 150ms one way delay.
>>>
>>>
>>>
>>> Does anyone know what these requirements are before we go ahead and
deploy?
>>>
>>>
>>>
>>> many thanks,  Keith.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>>>
>>
>


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