[Asterisk-code-review] res_pjsip_registrar: Remove unavailable contacts if exceeds max_contacts (asterisk[16])

[Joe]

Attention is currently required from: Joshua Colp, Joe.
Hello Sean Bright, Joshua Colp, Friendly Automation, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/c/asterisk/+/16160

to look at the new patch set (#6).

Change subject: res_pjsip_registrar: Remove unavailable contacts if exceeds max_contacts
......................................................................

res_pjsip_registrar: Remove unavailable contacts if exceeds max_contacts

The behavior of max_contacts and remove_existing are connected.  If
remove_existing is enabled, the soonest expiring contacts are removed.
This may occur when there is an unavailable contact.  Similarly,
when remove_existing is not enabled, registrations from good
endpoints are rejected in favor of retaining unavailable contacts.

This commit adds a new AOR option remove_unavailable, and the effect
of this setting will depend on remove_existing.  If remove_existing
is set to no, we will still remove unavailable contacts when they
exceed max_contacts, if there are any. If remove_exising is set to
yes, we will prioritize the removal of unavailable contacts before
those that are expiring soonest.

ASTERISK-29525

Change-Id: Ia2711b08f2b4d1177411b1be23e970d7fdff5784
---
M configs/samples/pjsip.conf.sample
A contrib/ast-db-manage/config/versions/f56d79a9f337_pjsip_create_remove_unavailable.py
A doc/CHANGES-staging/res_pjsip_registrar.txt
M include/asterisk/res_pjsip.h
M res/res_pjsip.c
M res/res_pjsip/location.c
M res/res_pjsip_registrar.c
7 files changed, 180 insertions(+), 18 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/60/16160/6
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Gerrit-Project: asterisk
Gerrit-Branch: 16
Gerrit-Change-Id: Ia2711b08f2b4d1177411b1be23e970d7fdff5784
Gerrit-Change-Number: 16160
Gerrit-PatchSet: 6
Gerrit-Owner: Joe <ynadiv at corpit.xyz>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-Reviewer: Sean Bright <sean at seanbright.com>
Gerrit-Attention: Joshua Colp <jcolp at sangoma.com>
Gerrit-Attention: Joe <ynadiv at corpit.xyz>
Gerrit-MessageType: newpatchset
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