Hanging up outbound calls while in transition

[tavaneftekhar]

When an outbound call is initiated and ringing, there is no hang up option.

In RingCX and the RC App there is a hang up option, allowing users to quickly end the call in several scenarios:

1. Typo in number
2. The call fails to connect and rings forever, which seems to occur for our users some percent of the time. This isn't an embeddable-specific issue, but the inability to hang up and retry the call to fix it is an embeddable issue