SOS (Emergency Text) Message Software

[Android Central Question]

I am developing an app that features an SOS button with preset messages to pre-selected numbers. The message is also supposed to ping on a PC in an emergency response centre. However, I cannot find a "call centre" software that will receive these SOS messages sent from the phone/app user where it will be escalated to the relevant response team.
What open source software solution is available to manage this feature? Have been looked high and low but cant seem to find what I am looking for, yet so many apps have this feature.
Kind regards