There main concept here: https://github.com/sipwise/rtpengine/wiki/Redis-keyspace-notifications
but few important thing to check:
1. Redis have disabled keyspace notification to enable change to notify-keyspace-events “AKE” in redis.conf
2. interface names should start exactly from “pub”
3. If you have not active interface IP on passive (pub2) rtpengine you have to set sysctl net.ipv4.ip_nonlocal_bind=1
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