[cisco-voip] Enabling CUCM/WebEx/B2B - firewall’ing thoughts?

[Brian Meade]

Lelio,

You don't need RMS licenses for Webex calls.  You need to use the exact
settings mentioned in the Webex CMR Guide though-
https://www.cisco.com/c/dam/en/us/td/docs/collaboration/webex_centers/esp/WebEx_Meeting_Center_Video_Conferencing_Enterprise_Deployment_Guide_WBS31_WBS32.pdf

Also Webex will typically try TLS inbound so I would just go with the _sips
SRV record and just open inbound 5061 along with the audio ports.  You can
disable TCP/UDP 5060 from the Expressway as well.

You can also setup mutual TLS with Webex for even more security.  That way
Expressway is only trusting Webex certificates for inbound calls.  Most of
that documentation is in the Hybrid Services Call Service Connect
documentation.

On Wed, Aug 1, 2018 at 9:09 AM Lelio Fulgenzi <lelio at uoguelph.ca> wrote:

>
> We’re finally taking a turn (not to be confused with TURN - hahaha) at
> getting CUCM talking to WebEx. Im guessing this is simply a B2B setup with
> the need for licenses.
>
> The question I have is whether or not I should be activating ACLs anywhere
> along the path to avoid the expressways from getting hammered and clogging
> up the logs.
>
> We’ll be enabling this on the MRA expressway pairs for the time being.
>
> From my understanding, MRA uses 5061, 8443, 5222 inbound and B2B uses
> 5060.
>
> Would it be advisable, to build ACLs only allowing certain address (space)
> to connect?
>
> This would be on top of any rules/zones we build into the ExpE and CUCM
> (css).
>
> We’re trying to avoid the obvious impact of scanning Ip addresses/uri’s
> for sip connectivity.
>
> What are people doing?
>
>
> *-sent from mobile device-*
>
>
> *Lelio Fulgenzi, B.A.* | Senior Analyst
>
> Computing and Communications Services | University of Guelph
>
> Room 037 Animal Science & Nutrition Bldg | 50 Stone Rd E | Guelph, ON |
> N1G 2W1
>
> 519-824-4120 Ext. 56354 <519-824-4120;56354> | lelio at uoguelph.ca
>
>
>
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>
>
>
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