[asterisk-users] PJSIP Lockup

Paddy Grice paddy at wizaner.com
Wed Apr 1 15:03:51 CDT 2020

Hi All
This sounds just like a problem I have had and still investigating having
moved to 16.9 using chan_sip. I am still trying to repeat the problem it
looks from debug that the issue is either voicemail of call transfer but I
cant consistently repeat it. 
Voicemail is using ODBC and I just imported the data from the old system
into the new database.
Nick - if you have any more info I would be grateful 

From: asterisk-users [mailto:asterisk-users-bounces at lists.digium.com] On
Behalf Of Nick Olsen
Sent: 01 April 2020 18:54
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] PJSIP Lockup

We ultimately found this to be a voicemail issue. The voicemail is held in
MYSQL as well (via ODBC). And we found when attempting to playback a
customers voicemail unavail greeting is when the deadlock would occur
(Immediately, every time. Throwing the same "task processors" errors, And
making pjsip completely unresponsive). We had imported a number of greetings
from a legacy asterisk system and the vast majority of them worked. When we
deleted the row containing the customers unavail greeting (making asterisk
revert to read the mailbox number) all issues went away. If we re-record the
customers unavail greeting it works fine and the problem doesn't reoccur.
This was one out of ~250 voicemails imported. 

Since then we've done a few more migrations and they've all gone smooth with
the exception of the most recent one. ~50% of the imported greetings have
caused asterisk to deadlock. We've been checking them now at time of

What I can't figure out is what it doesn't like about the greeting. It was
on a previous asterisk system working fine. The row looks identical to a
working one. The only thing I can guess is something about the blob for the
recording goes wrong. It would be nice if asterisk handled that more

I post this mostly just for internet history. To hopefully help the next guy
out who has this same issue.

Nick Olsen 
Network Engineer
Office: 321-408-5000 x103
Mobile: 321-794-0763

On Mon, Mar 2, 2020 at 8:29 PM Joshua C. Colp <jcolp at sangoma.com> wrote:

On Mon, Mar 2, 2020 at 4:24 PM Nick Olsen <nick at floridavirtualsolutions.com>

Thanks for the info, Joshua. 

Does PJSIP handle database access the same way Chan_sip did? We had a number
of boxes running chan_sip referencing the same mysql server without issue.

We're going to attempt to get a backtrace on the next occurance. We're also
going to run a local copy of the database on the same physical asterisk
instance and have the system reference it. Just to "throw everything at the

It uses the same underlying API and layer. It can do more frequent database
access though due to queries and because PJSIP is multithreaded.


Joshua C. Colp
Asterisk Technical Lead
Sangoma Technologies
Check us out at www.sangoma.com and www.asterisk.org

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