The app button on the phone for Finesse just says Host not Found. we can ping them both by IP and name. It just seems something from Call Manager isn’t finding them.
What versions of Call Manager and UCCX are you running?
Is this happening to all FIPPA users?
Can agents use desktop Finesse with Jabber or CIPC?
Is the app button using a name or an IP? My guess is that it is a name, but the DHCP information that the phones received does not include a DNS server. The phone will attempt to resolve names itself, it does not ask CM to do that.
Ensure that Service URLs are using FQDN and that the secure URL in UCCX is set for FQDN using https
With v12 make sure that the appropriate certificates have been generated and imported between UCM and UCCX reference steps here https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cust_contact/contact_center/crs/express_12_5/maintain_and_operate/guide/uccx_b_uccx-125admin-and-operations-guide/uccx_b_uccx-125admin-and-operations-guide_chapter_010101.html#task_8A5C9D193B9F5B72C...
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