CUBE Sizing?

[getjoecisco]

I've been searching all afternoon and been unable to find a sizing document for Cisco 2800 and 2900 series routers with CUBE.

I want to get a SIP trunk from my provider to replace our current PRI.

I need to know how many simultaneous calls each router model can handle.

Is there a document that outlines this information?

[dksingh]

Hi there,

Can u pl. provide some particulars (following) so that I can crunch

some numbers and give u some ballpark data to work with ?

Exact platform (ex: 2821, 2851, 2921, 2951 etc.)

cRTP on WAN ?

Pure CUBE SIP-SIP calls or other protocols as well?

CME or SRST ?

Any  TDM calls ?

Codec (g711/g729 etc.)

Packetization period (default=20ms) ?

Avg hold time

RTCP interval (default=5sec)

IPV4/6 ?

Any VXML/TCL app ?

DK

[getjoecisco]

2801 and 2811

no crtp

SIP-H323

SRST

No TDM

G711

Packetization, default

Avg hold time unknown

rctp interval, default

IPV4 only

No other apps

Thank you!

[James Hawkins · Accepted solution]

This should give you what you need

The 2900/3900 ISR's offer better failover and discount HA licensing so are a better choice for CUBE than 2800/3800.

Please rate if helpful.

[martinezfernando]

Hey guys,

I would like to know if there is a general statistic of how many Ip Phones a regular company uses simultaneously.

We are about to set 800 Ip Phones with a Catalyst 2951 and we are deciding on which FL-CUBEE-XXX (25,100 or 500), maybe Cisco has a recommended standard or you in your personal experience can help us decide.

Thank you very much.

[jleon22]

You might want to run it by an Erlang calculator. It's all math and theory on what the expectations are. This may give you a starting ballpark.

hope that helps!

[Ayodeji Okanlawon]

Hi,

in FL-CUBEE-XXX, XXX denotes the number of simultaneous sessions the CUBE can support. There is no one sizw fits all. It all depends on your requirements. A good way to start is to know how many e1/t1 lines do you have at the moment. You need to have an estimate of how many concurrent calls your uses do at the moment that will help you know which license to buy.

Dont also forget to inlcude bandwidth sizing in your plan. If you are using G.711, each call might take upto 80kbp including overheads etc. So you need to factor that into your plan. This is a crucial step in this scenario otherwise your provider will drop your calls once you exceed the bandwidth alloted to you

[pamistry]

A good ball-park number that lot of customers use :

For Large enterprises (more than 5000 users) - 1:5 ratio

which means for every 5 line side device, you count 1 session on the CUBE

For small-medium enterprises - 1:10 ratio

This is typically how customers determine how many CUBE sessions they need.

Thanks,

Pashmeen