Sentinel Hotline allows you to create multiple phone numbers that keep callers updated about an incident. Text-to-voice technology allows you to type your update into the system, which converts it to a voice message. This can be updated as often as necessary, can be PIN-protected along with the option for callers to leave voicemails for the hotline administrator to deal with.
The web-app can be purchased either as a monthly or annual subscription, and allows up to 500 inbound minutes a month, with overage costs as extra should you exceed your monthly limit.
Hotlines can be prepared in advance, and enabled or disabled so you are not being charged when they are not in active use.