Ring group calls in fail

Hi bit at a loss here. Had the PBX setup and running for a while with no problems, but now when some call in all the phones ring in the group as they should. But now when someone calls in, if one of the extensions is on a call, they just get a busy tone, or the call drops. I'm new to this and really don't know where to look for the problem. The ring group contains 7 phones and If I call in they all ring. If I then call in on another phone it still rings, as stated if one of the phones answers then the next call is either busy or fails. I do see DESTINATION_OUT_OF_ORDER but this does not make sense to me. Ive included some of the log when I make the second call.

b41a1fa1-aee6-4d40-b86e-932ab918bfab 2018-08-23 16:38:12.836713 [NOTICE] switch_core_session.c:1683 Session 320 (sofia/internal/106@192.168.1.25:5060) Ended
b41a1fa1-aee6-4d40-b86e-932ab918bfab 2018-08-23 16:38:12.836713 [NOTICE] switch_core_session.c:1687 Close Channel sofia/internal/106@192.168.1.25:5060 [CS_DESTROY]
b41a1fa1-aee6-4d40-b86e-932ab918bfab 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:741 (sofia/internal/106@192.168.1.25:5060) Running State Change CS_DESTROY (Cur 6 Tot 321)
b41a1fa1-aee6-4d40-b86e-932ab918bfab 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:751 (sofia/internal/106@192.168.1.25:5060) State DESTROY
b41a1fa1-aee6-4d40-b86e-932ab918bfab 2018-08-23 16:38:12.836713 [DEBUG] mod_sofia.c:343 sofia/internal/106@192.168.1.25:5060 SOFIA DESTROY
b41a1fa1-aee6-4d40-b86e-932ab918bfab 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:181 sofia/internal/106@192.168.1.25:5060 Standard DESTROY
b41a1fa1-aee6-4d40-b86e-932ab918bfab 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:751 (sofia/internal/106@192.168.1.25:5060) State DESTROY going to sleep
e60dfe80-9e7f-4d54-bd85-6ea124ca2d42 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:852 (sofia/external/07898435888@88.215.54.139) State HANGUP
e60dfe80-9e7f-4d54-bd85-6ea124ca2d42 2018-08-23 16:38:12.836713 [DEBUG] mod_sofia.c:432 sofia/external/07898435888@88.215.54.139 Overriding SIP cause 502 with 486 from the other leg
e60dfe80-9e7f-4d54-bd85-6ea124ca2d42 2018-08-23 16:38:12.836713 [DEBUG] mod_sofia.c:438 Channel sofia/external/07898435888@88.215.54.139 hanging up, cause: DESTINATION_OUT_OF_ORDER
e60dfe80-9e7f-4d54-bd85-6ea124ca2d42 2018-08-23 16:38:12.836713 [DEBUG] mod_sofia.c:577 Responding to INVITE with: 486
e60dfe80-9e7f-4d54-bd85-6ea124ca2d42 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:60 sofia/external/07898435888@88.215.54.139 Standard HANGUP, cause: DESTINATION_OUT_OF_ORDER
e60dfe80-9e7f-4d54-bd85-6ea124ca2d42 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:852 (sofia/external/07898435888@88.215.54.139) State HANGUP going to sleep
e60dfe80-9e7f-4d54-bd85-6ea124ca2d42 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:619 (sofia/external/07898435888@88.215.54.139) State Change CS_HANGUP -> CS_REPORTING
e60dfe80-9e7f-4d54-bd85-6ea124ca2d42 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:584 (sofia/external/07898435888@88.215.54.139) Running State Change CS_REPORTING (Cur 6 Tot 321)
e60dfe80-9e7f-4d54-bd85-6ea124ca2d42 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:938 (sofia/external/07898435888@88.215.54.139) State REPORTING
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:584 (sofia/internal/107@192.168.1.27:5060) Running State Change CS_HANGUP (Cur 6 Tot 321)
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:850 (sofia/internal/107@192.168.1.27:5060) Callstate Change DOWN -> HANGUP
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:852 (sofia/internal/107@192.168.1.27:5060) State HANGUP
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] mod_sofia.c:438 Channel sofia/internal/107@192.168.1.27:5060 hanging up, cause: USER_BUSY
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] mod_sofia.c:502 Sending CANCEL to sofia/internal/107@192.168.1.27:5060
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:60 sofia/internal/107@192.168.1.27:5060 Standard HANGUP, cause: USER_BUSY
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:852 (sofia/internal/107@192.168.1.27:5060) State HANGUP going to sleep
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:619 (sofia/internal/107@192.168.1.27:5060) State Change CS_HANGUP -> CS_REPORTING
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:584 (sofia/internal/107@192.168.1.27:5060) Running State Change CS_REPORTING (Cur 6 Tot 321)
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:938 (sofia/internal/107@192.168.1.27:5060) State REPORTING
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:174 sofia/internal/107@192.168.1.27:5060 Standard REPORTING, cause: USER_BUSY
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:938 (sofia/internal/107@192.168.1.27:5060) State REPORTING going to sleep
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_state_machine.c:610 (sofia/internal/107@192.168.1.27:5060) State Change CS_REPORTING -> CS_DESTROY
afc83a48-48e5-4353-85bb-d0a6e857e747 2018-08-23 16:38:12.836713 [DEBUG] switch_core_session.c:1665 Session 321 (sofia/internal/107@192.168.1.27:5060) Locked, Waiting on external entities
 
Just an update for anyone who is interested.

I removed the ring group and re added it and then reloaded the XML and ACL. This seems to have worked. The only other thing I did was to remove one of the phones from the Ring group which did not need to be in it.