Questions about Call Manager cluster

[wilson_1234_2]

These are just some basic questions:

If you have a call manager cluster of one Publisher and two Subscribers

System version: 7.1.5.32900-2

Can calls be load balanced across the three servers, or is only one of the three serviceing calls?

If only one, what determines which one is "active"?

[wilson_1234_2]

William,

I am new to voice and interested in leaning the items you mentioned here :

"SIP->CUBE->CM02-(ICCS)->CM03->Phone  (signaling path)

SIP->CUBE->Phone (media path, unless you have some MTP in play we haven't discussed)

In the signal path you will see (ICCS). This is the real-time Intra-Cluster Communication Signaling that CUCM nodes use to slice and dice call setup. "

I am very interested in what happens with the signaling and media paths when a person calls and gets IPCC CAD agent.

Do you know of any good resources?

[William Bell]

Wilson,

If you are asking about IPCC Enterprise, then I don't have the adequate background to give you an intelligent answer. With IPCC Express (now UCCX), the call flow goes something like this:

1. Carrier network hands call to voice gateway or border element
2. voice gateway or border element sends call setup request to CUCM
3. CUCM digit analysis evaluated the dialed number (DN) in the call setup request and, if this is a UCCX call, matches a CTI Route Point that UCCX has registered with CUCM
4. CUCM sends a JTAPI Route Request (RR) to the UCCX system
5. UCCX receives the RR and determines (a) what application the DN is associated with, (b) what telephony group should be used to handle the call, and (c) which telephony group member is available to receive the call/media path
6. UCCX replies to the CUCM RR with the extension assigned to the CTI port identified in 5(c) [above]
7. The CUCM redirects the call setup to the CTI port in the RR response
8. The CTI port answers, UCCX has instructed the port to load a specific application script, and, if your script has an Accept step, the call is established.
9. The Script IVR/procedures/etc. are loaded and ran as normal

The best source of info on the UCCX Call Flow is in the SRND:

http://www.cisco.com/en/US/solutions/ns340/ns414/ns742/ns818/landing_ipcc_express.html

Pick the SRND for your version. Call flow should be in the "Unified CCX Call Processing" chapter (which I think is Chapter 2).

For IPCC Enterprise, the call flow is similar but has its own recipe. I haven't researched it too heavily myself, but the SRNDs for IPCC Enterprise do lay out various call flows. Excellent place to start:

http://www.cisco.com/en/US/solutions/ns340/ns414/ns742/ns818/landing_contact_ctr.html

HTH.

Regards,

Bill