cucme sip phone can not hung up from external calls

[luoketiantiantian]

cucme sip phone unanswered external calls that were hung up will cause the main line to keep ringing

[Roger Kallberg]

Please do not create duplicate posts. This is duplicate to this post. https://community.cisco.com/t5/ip-telephony-and-phones/cucme-cannot-hang-up-external-calls/m-p/5309030#M419710