# Push status indication

Since version 3.34, SIPIS includes `X-Sipis-Push-Status` header
in its provisional responses to incoming INVITE requests.
Whenever the push status changes SIPIS will generate another
provisional response with the appropriate value of the
`X-Sipis-Push-Status` header.

The possible values of the header are:

- `Alerting-Device`
- `Push-Notification-Sent`
- `Device-Making-Progress`

## Alerting-Device

The `Alerting-Device` status means that SIPIS is trying to
alert the user's device(s) about the incoming call via push
notification service and so far no device has attempted to
answer the call.

## Push-Notification-Sent

The `Push-Notification-Sent` status means that SIPIS
received positive confirmation that its push notification
was accepted by a platform specific service.

## Device-Making-Progress

The `Device-Making-Progress` status means that SIPIS has
detected that a device is actually attempting to answer the
incoming call.