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

[Ki Wi]

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 Single Number Reach (WA)****
>
> 317.569.4255 Single Number Reach (IN)
> 317.569.4201 Fax
> 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 don’t
> 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**
> *
>
> *D: 615-866-5729* | *F: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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