SipOutgoingCallDigestAuthenticationRequired

This event informs application software that an attempt was made to initiate an outbound phone call that required "Digest" authentication. The phone call will fail because the media engine was not configured with the proper authorization credentials in order to create a valid response to the far end's authentication challenge.

If you receive this event, you should call the AddAuthorizationCredentials API procedure with the proper values so the media engine can respond to Digest authentication challenges with the proper response.