Last week, we renewed the certificates on our expressways, CUCM and IM&P. Since then Jabber can't register to the phone services from outside the network. Inside the network, jabber works fine.
PS: There is no connectivity problem nor DNS problem .
What troubleshooting steps have you done? Have you checked the zone status in Exp-C and -E? Have you taken logs of Exp-C and / or Jabber to nail the problem down?
Your problem can be anything without you doing first troubleshooting ... Take logs of the Expressway and Jabber and let it analyze here: https://cway.cisco.com/csa-new
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