3cx client on Android continues to ring

[novatel]

Hello,
may any one gives some idea regarding the following issue : 3cx client on mobile, OS Android continues to ring after the call has been answered from yealink phone device for the same extension.
Parameter in PBX Settings SIP_FORKED_ID_BUSY is set to 1.
Thanks!

 

[YiannisH_3CX]

Hello @novatel

It looks like the Cancel SIP message does not reach the Android client so the client continues to ring after the call has been answered. Does the client continue to ring for a long time? How is the Yealink phone provisioned ? Is it a local device or remote? Also is the client local or remote?
What happens if you add a second IP phone on the same extension and try the same test? Does the second phone stops ringing?