This documentation is archived and is not being maintained.

Canceling an Outgoing Session

This content is no longer actively maintained. It is provided as is, for anyone who may still be using these technologies, with no warranties or claims of accuracy with regard to the most recent product version or service release.

Use the Terminate method to cancel connecting or Alerted sessions. In Session Initiation Protocol (SIP) messaging there is a distinction between an established or connected session; and a session that is connecting or alerted, in other words one that is not accepted yet by the remote endpoint.

  • When terminating a connected session, a BYE is sent to the remote endpoint.
  • When canceling a connecting (or alerted, or outgoing) session, a CANCEL request is sent to the remote endpoint that is then acknowledged by a 200OK. The INVITE transaction then receives a 487 response from the remote endpoint.

Unified Communications Managed API version 1.0 exposes one method, the Terminate method, to terminate both types of sessions - established and not established. See the example in Terminating an Established Session.

Show: