[cisco-voip] Bandwidth planning, design and overhaul question

[Matthew Saskin]

It would probably make a bit more sense to express things in terms of 
their current busy hour call volume - i.e.; on any given day what is the 
maximum number of concurrent calls they have going at any one point in time.

While it's always good to let people know the maximum (i.e.; 10 calls 
inbound/outbound total) it seems like a better idea to plan for slightly 
higher than average usage (take the avg. call volume, add in some safety 
buffer, and done).

It really depends on the application...is voice a mission critical 
function at this enterprise?  Is data more critical?  Are you [they] 
prepared to have one suffer in exchange for the other?  How much of a 
workflow interruption is a re-order tone and having to wait a short 
while to try calling again?  Is the extra cost of more bandwidth 
acceptable compared to potentially lost productivity?

-matt

J. Oquendo wrote:
> Hey all, I have a quick question on the design aspect of things which doesn't necessarily pertain to Cisco. Supposing I have a SoHo company with 38 users and they're using a Data T1 with 10 lines.
>
> If I were to design this network would it be safe in using the current ratios:
>
> 10(lines) * AMOUNT_OF_CODEC_BANDWITH = Maximum_Outbound_VoiP_Capacity
>
> I ask this simple question because I have a scenario I'm trying to be modest/political about where a bandwidth upgrade is being questioned.
>
> The maximum amount of calls in or out would be the 10 lines no? Which would be a constant 846kbp/s using 711 codes 430 using 729 without including data which I can police.
>
> SampleClient's current bandwidth information. Bear in mind this is a 8am-6pm operation which is why the average is low. If I had to average during business hours, the average is about 338kbp/s
>
> Daily Traffic (5 Minute Average) *VoIP ONLY*
>
>      Max                   Average              Current
> In      508.3 kb/s (0.1%)     58.7 kb/s (0.0%)     66.5 kb/s (0.0%)
> Out     508.0 kb/s (0.1%)     56.9 kb/s (0.0%)     64.3 kb/s (0.0%)
>
> Weekly Traffic (30 Minute Average) *VoIP ONLY*
>
>      Max                   Average              Current
> In      490.3 kb/s (0.0%)     58.8 kb/s (0.0%)     23.0 kb/s (0.0%)
> Out     480.9 kb/s (0.0%)     56.5 kb/s (0.0%)     21.8 kb/s (0.0%)
>
>
> Monthly Traffic (2 Hour Average) *VoIP ONLY*
>
>     Max                   Average              Current
> In      343.3 kb/s (0.0%)     62.9 kb/s (0.0%)     10.4 kb/s (0.0%)
> Out     341.2 kb/s (0.0%)     60.9 kb/s (0.0%)     9952.0 b/s (0.0%)
>
> ... So long story short... Outside of multiplying phones to bandwidth, since they only have 10 lines, is it safe to use that maximum as their threshold... E.g: 10(lines) * 711Codecs = 846kbps for VoIP traffic? 
>
> Thanks in advance..
>
> =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
> J. Oquendo
> echo @infiltrated|sed 's/^/sil/g;s/$/.net/g'
> http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x1383A743
>
> "How a man plays the game shows something of his
> character - how he loses shows all" - Mr. Luckey 
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