The Call-ID of outbound registrations was the sip_gateway_sid, the same on
every SBC. When the regbot role moved to the other SBC, the registrar saw a
refresh of an existing binding from a different source address and Contact.
Some registrars 200 such a refresh without updating their routing, so inbound
calls to the registered trunk fail with 404 until the binding is recreated.
The Call-ID is now sip_gateway_sid@<sending SBC public IP>: stable across
refreshes and restarts of one SBC, new when the role moves, so a move looks
like a new registration. register_status also records the sending SBC as
sbcAddress.
With AWS_LIFECYCLE_DRAIN enabled the sidecar polls IMDS
autoscaling/target-lifecycle-state (the signal inbound drains on; detection
only, inbound completes the lifecycle hook). When the instance is being scaled
in, the regbot holder releases the lease while still running instead of after
the instance is gone; until now the draining SBC kept the registrations, so
carriers kept sending registration-trunk calls to an SBC that answers new
INVITEs with 503. It never claims the role back. Once another SBC has claimed
it, the draining SBC un-REGISTERs (Expires: 0) the bindings whose Contact
carries its own IP. Bindings with an AoR or realm Contact are left alone: the
new SBC sends the same Contact, and its REGISTER has already replaced ours.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
* create regbog in batch with delay, filter inique gateway before creating regbot
* update review comment
* do not register outbound if no sip password was provided
---------
Co-authored-by: Dave Horton <daveh@beachdognet.com>
* disable options ping on defined errors
* correct sid
* disable reg on error
* fix path
* fixes from testing
* fixes from testing
* lint
* update dbhelpers dep
* remove whitespace in CONFIG strings
* lint
* this seems like a better way of convering and matching status codes
* Add envvar support for default expiration interval
* Move envvars to config file, finish work, and add description of envvars to Readme
* Set expires value to MIN_EXPIRES when the retrieved value is lower than it or not parseable
