[cisco-voip] How does voice recorder works? Do I need RSPAN or ERSPAN?

[Leslie Meade]

I found this blog a source of good information about span etc

http://packetpushers.net/rspan-over-l2tpv3-is-that-even-possible/


 
Salient Service
760.930.2636 <tel:760.930.2636> , support at salientnetworks.com
Request Line (moves adds and changes only)
760.930.2699 <tel:760.930.2699> , macs at salientnetworks.com

From:  Ki Wi <kiwi.voice at gmail.com>
Date:  Thu, 29 Dec 2011 00:21:29 +0800
To:  "Buchanan, James" <jbuchanan at presidio.com>
Cc:  Cisco VoIP List <cisco-voip at puck.nether.net>
Subject:  Re: [cisco-voip] How does voice recorder works? Do I need RSPAN or
ERSPAN?

It's by nexlabs. A local product in my country.

On Thu, Dec 29, 2011 at 12:02 AM, Buchanan, James <jbuchanan at presidio.com>
wrote:
> What product are you using?
> 
>  
> James Buchanan| UC Technology Manager | Presidio South | Presidio Networked
> Solutions 
> 12 Cadillac Dr Ste 130 Brentwood, TN 37027 | jbuchanan at presidio.com
> <mailto:jbuchanan at presidio.com>
> D: 615-866-5729 <tel:615-866-5729>  | F:615-866-5781 <tel:615-866-5781>
> www.presidio.com <http://www.presidio.com/>
>  
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ki Wi
> Sent: Wednesday, December 28, 2011 6:29 AM
> To: Cisco VoIP List
> 
> 
> Subject: Re: [cisco-voip] How does voice recorder works? Do I need RSPAN or
> ERSPAN?
>  
> Anyone have any idea on this?
> 
> On Tue, Dec 27, 2011 at 2:56 PM, Ki Wi <kiwi.voice at gmail.com> wrote:
> Hi Dennis/James, 
> Thanks for the quick reply.
> 
> The product that the customer have actually works for port mirror scenarios.
> I'm aware that those products are actually looking for SCCP messages during
> their capture. However, I'm wondering is the SCCP messages from the phone port
> (will see both tx/rx packets to the phone) sufficient ? Or do I need to span
> extra signalling messages from CUCM and as well as those extra rtp stream from
> voice gateway? 
> 
> Currently, my best practise is i will span all the rx traffic into the voice
> vlan (ingress traffic into switchport) and rspan it to the recorder. However,
> now i'm hoping that I can simply sniff both tx/rx packets on the few IP phones
> that requires recording.
> 
> *imaging the site have 2000 phones and i only need to record 5 ip phones
> conversation in the network, the software vendor is worried about the cpu
> utilization as well if we were to enable span traffic everywhere*
> 
> 
> 
>  
> 
> On Tue, Dec 27, 2011 at 2:21 PM, Dennis Heim <Dennis.Heim at cdw.com> wrote:
> 
> Many of the products offer either one of the following or a combination of the
> above: (1)Port Mirroring (2) Built-In Bridge (BiB) (3) Software on PC. You
> also need to determine if you need to record all calls, external only,
> internal only, etc.
>  
> 
> Dennis Heim
> Senior Engineer (Unified Communications)
> CDW  Advanced Technology Services
> 10610 9th Place
> Bellevue, WA 98004
> 
> 425.310.5299 <tel:425.310.5299>  Single Number Reach (WA)
> 317.569.4255 <tel:317.569.4255>  Single Number Reach (IN)
> 317.569.4201 <tel:317.569.4201>  Fax
> dennis.heim at cdw.com <mailto:dennis.heim at cdw.com>
> cdw.com/content/solutions/unified-communications/
> <http://www.cdw.com/content/solutions/unified-communications/>
>  
> 
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Buchanan, James
> Sent: Tuesday, December 27, 2011 12:07 AM
> To: Ki Wi; Cisco VoIP List
> Subject: Re: [cisco-voip] How does voice recorder works? Do I need RSPAN or
> ERSPAN?
> 
>  
> Depends on the voice recording product you are using. The newer ones don¹t
> require SPAN at all in many cases.
>  
> James Buchanan| UC Technology Manager | Presidio South | Presidio Networked
> Solutions 
> 12 Cadillac Dr Ste 130 Brentwood, TN 37027 | jbuchanan at presidio.com
> <mailto:jbuchanan at presidio.com>
> D: 615-866-5729 <tel:615-866-5729>  | F:615-866-5781 <tel:615-866-5781>
> www.presidio.com <http://www.presidio.com/>
>  
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ki Wi
> Sent: Monday, December 26, 2011 10:44 PM
> To: Cisco VoIP List
> Subject: [cisco-voip] How does voice recorder works? Do I need RSPAN or
> ERSPAN?
>  
> I have a setup with 2 DC . There's couple of voice gateway and cucm in each
> DC. 
> 
> There's a couple of distribution switches as well.
> 
> Between 2 DC and distribution switches are all L3.
> 
> Today, my requirement is only to span a few ports connected to the access
> switches of distribution switch "A". If I do a rspan from those IP phones back
> to distribution switch "A" and I will connect the voice recorder to
> distribution switch "A", will it work?
> 
> Is it neccessary for me to span the traffic from cucm and voice gateway as
> well? If so, ERSPAN is required.
>  
>  

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