Send email when extension unreachable

Good Afternoon Colleagues
I hope you are doing good and safe.

Thanks to @Charles_Darwin , I have successfully modified the code shared by him in the below thread to match PJSIP

Here is the modified shell script:

email="[email protected]"
/usr/sbin/asterisk -rx ‘pjsip show endpoints’ > /tmp/allExtensions.txt
offlineExtensions=cat /tmp/allExtensions.txt| grep -e 'Unavailable'
if [ -z “$offlineExtensions” ]; then
echo “Subject: Offline Extensions”
printf ‘freePBX_Server_Location SIP Extensions or Trunks that are currently offline…\n’’\n’"${offlineExtensions}"
) | /usr/sbin/sendmail ${email}

Below is the crontab:
*/5 * * * * /root/ > /dev/null 2>&1

The crontab sends email every 5 minutes with list of unavailable endpoints .

May i know if there is a way to send email immediately and not periodically when an endpoint is unavailable and only send email regarding this endpoint only not all unavailable endpoints?

Best Regards

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