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We were required to change any 88xx phones with more than 2 lines to ELM when our last network switch upgrade was completed. Phones would continuously cycle between registered and unregistered. ELM solved the issue. However, users complain because ...
https://community.cisco.com/t5/ip-telephony-and-phones/8851-phones-in-partial-registered-state/td-p/3010535We had this issue and ELM helped resolve. Maybe since I upgraded to 12.5 I can revert back to SLM.
