weronika
04/01/2026, 3:48 PMAI Evy
04/01/2026, 3:48 PMAI Evy
04/01/2026, 3:48 PM{{call_id}} that captures the current call session id [(1) ]() . This is one of the default system variables that Retell automatically provides for phone calls .
The {{call_id}} variable returns the unique identifier for the current call session, for example: call_12345678906eaa0222bd3dd2a6c .
You can use this variable in your prompts, begin messages, tool configurations, or other supported fields by typing {{call_id}} .AI Evy
04/01/2026, 3:48 PMAI Evy
04/01/2026, 3:48 PM