Best Callmanager Design for 21 remote sites

[harmit]

Hi,

have to design plan for impletentation of IPT network having 500 IP phones at HO(central office) and 100 IP phones at 21 branch offices(remote office) .

Which will be best design for such implementation.

regards

Harmit

router007@gmail.com

[m.singer]

This URL might help you.

http://www.cisco.com/en/US/products/sw/cscowork/ps2432/tsd_products_support_design_technotes_list.html

[brent.williams]

There are a lot of things to consider.

How much latency do you have between these sites?

How much bandwidth?

What is your network topology (full mesh, hub-and-spoke, etc.)?

How reliable are your network links?

Also, is that 100 phones at EACH of the 21 offices? or 100 total phones spread across 21 sites?

If it is a total of 600 phones, I'd install a single CCM cluster in the HQ site. The local gateways at the remote sites (2801 routers should be fine) should be configured for SRST.

[allan.wells]

Also

1.where are the sites located ? different countries states ?

2.How Much BW between each site

3. What encapsulation is used on wan (ATM, CIR of frame no BE, PPP, MPLS)

4.How many calls do you want bewteen sites

5.Centralised cluster is OK for hub and spoke topology (otherwise CAC needs consideration)example HUB---frame----office1----office2 this scenario restricts the amount of calls to the LLQ size from HUB to site 1. So if you had LLQ of 512k configured on the HUB--remote1 link you could set up two locations in CM hub to site 1 384k and hub to site 2 128 the LLQ on site 1 to site two 128 just a thought for that topology.

6.www.cisco.com/go/srnd --Split cluster is good 40ms RTT needed with a Propagation delay between two sites introduces 6 microseconds per kilometer without any other network delays being considered. This equates to a theoretical maximum distance of approximately 3000 km for 20 ms delay or approximately 1860 miles + you need approx 1.5mb for intra cluster comunications.

Interested to know more

Allan