Yes, BFCP was not enabled on the SIP profile. We can now share the inside screen to the outside, but the outside sees a black screen. Could this be firewall or something else?
For jabber guest
Re: For jabber guest deployement only internal users who have video endpoint can share the screens
Since JG 11.0, guest users are able to share screen to internal users form desktop.
below is how you can screen share in
Applies to Cisco Jabber for desktop clients in cloud deployments.
For cloud deployments, this is the default screen share when BFCP and IM Only screen share options are not available. For example, when BFCP and IM Only screen shares are not enabled or the user you are attempting to share with doesn't have those options.
This option is available in the client by using one of the following methods:
Applies to Cisco Jabber desktop clients, Cisco Jabber for mobile clients can only receive BFCP screen shares.
Binary Floor Control Protocol (BFCP) screen share is controlled by Cisco Unified Communications Manager. Cisco Unified Communications Manager handles the BFCP packets that users transmit when using video desktop sharing capabilities. When on a call select ... > Share screen to start a BFCP screen share.
Remote screen control is not supported with this feature.
Applies to Cisco Jabber for Windows.
IM Only screen share is a one to one screen share and is enabled using the EnableP2PDesktopShare parameter in the jabber-config.xml file. In a chat window users select ... > Share screen.
The port range for this option is 49152 to 65535 and this can be reduced by using the SharePortRangeStartand SharePortRangeSize parameters in the jabber-config.xml file.
Applies to all Cisco Jabber clients.
You can escalate to an instant Cisco WebEx meeting and share your screen using the Cisco WebEx meeting controls.
(Rate if it helps)