No information if incoming call was cancelled with "Call completed elsewhere" reason. Hacky workaround

[roginvs]

If call was cancelled with "Call completed elsewhere" reason, then this call should not be considered as missed. Sipml5 does not send any information about this in 'terminated' call session event. I added this hacky workaround into sipml5 https://github.com/roginvs/sipml5/commit/1e260846116d119b261fee0c9f0927d5f2a14801 in order to make sipml5 to send "Call completed elsewhere" inside 'terminated' event description. In perfect world sipml5 should send all reasons inside event.