How can a problem be acknowledged using a text message (SMS)?

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First you need to enable incoming text messages and the event-handler in

/etc/smsd.conf

Change the setting

incoming = no

incoming = yes

Then add:

eventhandler = /opt/monitor/op5/smsreceive/smsreceiver/smsreceiver.php

...in the device section (usually GSM1) and restart the smsd service with service smsd restart on EL6, or systemctl restart smsd on EL7.

When acknowledging a problem via SMS you can use two different approaches:

Either you just forward (copy-paste) the notification back to the number it came from (called a "dynamic sms")
or you manually compose a reply (called "static format").

Dynamic sms does not support acknowledgement comments.

If you use the static format, use the following format:

Host ack:

hostack;host-name;comment

Service ack:

serviceack;host-name;service-description;comment

Make sure contact is updated with proper mobile number ('Pager' field in contact form).