Question

A remote employee reports that Cisco Jabber cannot sign in over Mobile and Remote Access (MRA), but the same account works fine when connected to the corporate VPN. Packet captures show Jabber successfully resolving the internal home cluster address, but it never reaches the Expressway-E. The administrator confirms the _collab-edge SRV record is missing from the external DNS. What is the most likely effect of this missing record, and what should the administrator do?

Accepted Answer

Jabber falls back to internal UDS service discovery and cannot traverse MRA; add the _collab-edge._tls SRV record pointing to the Expressway-E FQDN on port 8443

Answer

Jabber cannot validate the Expressway-E certificate; reissue the certificate with the internal CUCM FQDN in the SAN

Answer

Jabber uses the _cisco-uds SRV record externally; add _cisco-uds._tcp to the public DNS pointing to CUCM on port 8443

Answer

Jabber cannot register because the Expressway-C traversal zone is down; restart the traversal server zone on Expressway-C