v2.billing.credit.topup = Your account has been credited with a new amount.
v2.billing.credit.warning = Your prepaid balance has reached its warning level.
v2.billing.credit.shutdown = Your prepaid balance has reached its shutdown level. Your account is suspended.
v2.call.inbound.started = An inbound call just started.
v2.call.inbound.ended = An inbound call just hung up.
v2.call.outbound.started = An outbound call just started.
v2.call.outbound.ended = An outbound call just hung up.
v2.number.assigned = A phone number was assigned to your account.
v2.number.unassigned = A phone number was unassigned from your account.
v2.task.updated = A task has been updated.
v2.audio-file.updated = An audio file has been updated.
v2.recording.updated = A recording has been updated.
v2.sms.inbound.received = An inbound SMS has been received.
v2.sms.outbound.updated = An outbound SMS has an updated status.