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

[J. Oquendo]

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