esc

C → S → C {type: 'esc'}

esc – end call. Usually sent by client who wants to end or deny a call. Forwarded by server to other client.

S → C {type: 'esc'}

Server might also send esc message by itself.

optional arguments:

• response - SIP response code:
  • 404: address you attempted to call not found
  • 480: address you attempted to call temporarily unavailable
  • 486: call was denied, busy
  • 0 or missing: call ended normal ("hung up" by other side)
  • other response codes may also occur
• msg - response description in english

Message esc without optional arguments indicate normal call ending ("hung up" by other end).