OptionalcostEstimated carrier cost rate per minute in reporting currency (e.g. 0.015 for 1.5 cents/min). Used to compute Interaction.CostEstimate at call end. Defaults to 0.015 if unset.
OptionalinboundEmail of the user INBOUND calls run as. Required for inbound calls: if unset, unknown, inactive, or the system user, the call is rejected (there is deliberately no fallback to a privileged user). Point it at a dedicated least-privilege account.
OptionalmaxMaximum length of one phone call in seconds (default 1800). The session is stopped at the cap.
OptionalmaxMost phone calls (every carrier together, both directions) the server will carry at once (default 25). Keep this at or below the realtime model plan's concurrent-session limit: past the cap an inbound caller hears a polite "all agents are busy" and an outbound call is refused, instead of every call degrading.
OptionaloutboundOutbound destination policy and per-user rate limit applied to every Place*Call mutation.
OptionaltransferThe places the agent may transfer a live call to, by name. Empty or absent means the agent cannot transfer at all, even on a carrier that supports it: the agent never names a free-form number.
Settings that apply to every carrier. They are configured once under
telephonyand merged into each carrier's extension settings by the host (a carrier block may override them).