Shared Call Appearance unstable

[CraigFox]

The SCA feature seems unstable. Calls are dropped while on hold.

In my scenario, two phones (T48s and W56p) are configured with the same extension (201). SCA seems to work fine, I can place a call on hold on one phone and pick up the call on the other and visa-versa.

If /when the active call drops, the W56p still sees an active SCA call (201 - held) while the T48s, accurately, shows no active call. The only way to get W56p, still seeing the an active SCA, to reset its call appearance is to initiate another call from the T48p.

I have been able to reproduce this. It only happens if the W56p is the device that places the call on hold. If the T48s places the call on hold the calls remain active until one of the devices picks up the call. After the W56p places the call on hold, the call drops 36 later. This will not happen if the call was put on hold from the T48s. Also active (talking) calls will not drop.

Using FreeSwitch v1.6.18
W56p Base firmware: 61.0.0.11
W56p Handset firmware 61.20.0.15