pipecat/changelog/4349.changed.md

• ⚠️ PlivoFrameSerializer and TelnyxFrameSerializer now raise ValueError at construction when auto_hang_up=True (the default) but required credentials are missing, matching TwilioFrameSerializer. Previously they constructed successfully and the hangup failed silently at call-end, leaving phantom billable sessions on the provider. If you relied on the old silent behavior, pass auto_hang_up=False explicitly or provide the credentials. The specific fields checked are call_id/auth_id/auth_token for Plivo and call_control_id/api_key for Telnyx.