SIP methods and call flow: INVITE, ACK, BYE, and CANCEL
Follow the main SIP methods and understand the normal sequence for registration, call setup, cancellation, transfer, and teardown.
Symptoms
Symptoms
Follow the main SIP methods and understand the normal sequence for registration, call setup, cancellation, transfer, and teardown.
Diagnose registration failures, one-way audio, and dropped calls caused by NAT, firewalls, and incorrect SIP or RTP address handling.