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understanding VoIP architecture

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freemen replied on Tue, Aug 5 2008 1:53 PM
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I've been looking at the documentation for VoIP and I want to make sure I understand how it works. See if I have this right.

VoIP uses IP SLA to generate simulated voice calls between Cisco CallManagers. These CallManagers (routers) are located at "sites" that the user designates. Can a site and a callmanager node be one and the same?

You also designate call paths between the sites. Right?

Also, VoIP works only with Cisco right now, but can monitor other manufacturer voice equipment through custom pollers. Does that mean that if I have Avaya IP phones added as Orion nodes, I must still construct custom pollers if I want to get any SNMP data from them?

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freemen replied on Wed, Aug 6 2008 12:09 PM
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bump?

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mcbridea replied on Wed, Aug 6 2008 12:40 PM
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Hi freeman,

We leverage the IPSLA capabilities of Cisco routers to simulate voice traffic and report on delay, jitter and MOS. So as long as you have Cisco routers at VoIP sites you will get site-to-site VoIP quality stats. The call manager has nothing to do with that part. We use SNMP to monitor the call manager. If you are using a Cisco Integrated Services Router the two could be on the same box but that doesn't matter in how we monitor VoIP. Page 24 gives some good info on adding call managers other than Cisco and you also can use Orion 9.0 Universal Device Poller (UnDP). The installation wizard in VoIP helps walk you through setting up site IPSLA  to match your topology.

Andy

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freemen replied on Wed, Aug 6 2008 1:13 PM
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So, how does VoIP Monitor deal with Avaya Call Managers versus Cisco Call Managers?

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mcbridea replied on Wed, Aug 6 2008 1:34 PM
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We use SNMP to poll for basic CM stats like phones connected etc. With UnDP you build the poller so you can monitor anything in the Avaya CM MIB. Looks like Avaya MIBS are pretty detailed.

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freemen replied on Thu, Aug 7 2008 9:46 AM
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OK, so let's see if I am understanding a little better.

Each "site" must have a Cisco router or switch that is IP SLA compatible and configured. These sites are linked along defined call paths so that the VoIP QoS data can be colected via simulated calls. Right?

Beyond that, one can add non-Cisco call managers so that VoIP can poll them via SNMP for VoIP-related data like phones connected, etc.

Am I getting it?

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borgan replied on Fri, Aug 8 2008 9:04 AM
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Hmmmm?

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Corona Technical Services

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mcbridea replied on Fri, Aug 8 2008 9:11 AM
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Yes - next step download it and try it for free!

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freemen replied on Mon, Nov 3 2008 7:49 PM
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ty

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