Learn the required Expressway-C configuration to allow advanced file transfer in Cisco Jabber when using Mobile and Remote Access (MRA) in multisite UC deployments.
Table of Contents
Question
In a larger Cisco Collaboration deployment, a user requires the advanced file transfer function in Cisco Jabber while the client is using Mobile and Remote Access. The deployment has multiple Expressway clusters and internal Cisco UCM clusters. Which configuration must be applied on Cisco Expressway-C for this function to be available?
A. The HTTP Allow List must be manual or use Automatic inbound rules updated to include all Cisco IM and Presence servers.
B. The HTTPS Allow List must be manual or use Automatic inbound rules updated to include all Cisco IM and Presence servers.
C. The HTTP Allow List must use Automatic update rules to include all Cisco UCM servers.
D. The HTTP Allow List must use Automatic update rules to include all Cisco IM and Presence servers.
Answer
To enable the advanced file transfer function in Cisco Jabber over Mobile and Remote Access (MRA) in a large multisite Cisco Collaboration deployment with multiple Expressway clusters and Cisco Unified Communications Manager (UCM) clusters, the following configuration must be applied on Cisco Expressway-C:
B. The HTTPS Allow List must be manual or use Automatic inbound rules updated to include all Cisco IM and Presence servers.
Explanation
Advanced file transfer in Jabber relies on HTTP/HTTPS access to the Cisco IM and Presence servers. For this feature to work over MRA, the Expressway-C must allow HTTP/HTTPS traffic from Jabber clients to reach the IM and Presence servers.
This is accomplished by configuring the HTTP Allow List on Expressway-C to include all IM and Presence servers. The Allow List can be set up in manual mode, where the administrator explicitly adds the IP addresses or FQDNs of the IM and Presence servers. Alternatively, automatic inbound rules mode can be used, which automatically allows traffic to the IM and Presence servers based on their _cisco-uds SRV records.
The other options are incorrect because:
- HTTPS Allow List is not used for this purpose; HTTP Allow List is the correct setting.
- The Allow List must include the IM and Presence servers, not the Cisco UCM servers.
In summary, configuring the HTTP Allow List on Expressway-C to allow traffic to all IM and Presence servers, either manually or using automatic inbound rules, is necessary to enable advanced Jabber file transfer over MRA in this deployment scenario.
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