res_pjsip_mwi: fix unsolicited mwi blocks PJSIP stack

The PJSIP taskprocessors could be overflowed on startup
if there are many (thousands) realtime endpoints
configured with unsolicited mwi.
The PJSIP stack could be totally unresponsive for a few minutes
after boot completed.

This patch creates a separate PJSIP serializers pool for mwi
and makes unsolicited mwi use serializers from this pool.
This patch also adds 2 new global options to tune taskprocessor
alert levels: 'mwi_tps_queue_high' and 'mwi_tps_queue_low'.

This patch also adds new global option 'mwi_disable_initial_unsolicited'
to disable sending unsolicited mwi to all endpoints on startup.
If disabled then unsolicited mwi will start processing
on next endpoint's contact update.

ASTERISK-26230 #close

Change-Id: I4c8ecb82c249eb887930980a800c9f87f28f861a

1 files changed, 9 insertions, 0 deletions

diff --git a/CHANGES b/CHANGES
index 08a580cf0..d46765c81 100644
--- a/CHANGES
+++ b/CHANGES
@@ -377,6 +377,15 @@ app_voicemail
    Additional information can be found in the sample configuration file at
    config/samples/voicemail.conf.sample.
 
+res_pjsip_mwi
+------------------
+ * Added "mwi_tps_queue_high" and "mwi_tps_queue_low" global configuration
+   options to tune taskprocessor alert levels.
+ * Added "mwi_disable_initial_unsolicited" global configuration option
+   to disable sending unsolicited MWI to all endpoints on startup.
+   Additional information can be found in the sample configuration file at
+   config/samples/pjsip.conf.sample.
+
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 --- Functionality changes from Asterisk 13.10.0 to Asterisk 13.11.0 ----------
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