Went through a git bisect on this, and tracked the behavior change to this commit;



commit 40bfe0fff566476ff95242581f391f5b5b1c7e32
Author: Anthony Minessale <anthm@freeswitch.org>
Date:   Mon Jan 16 15:27:36 2017 -0600

    FS-9154: [freeswitch-core] Add & remove video on re-invites #resolve


Note that these calls do NOT have any video.

I've added this info to FS-9983 jira issue which looks highly related, but will go ahead and file a new jira issue as well.

-- Nathan



From: Nathan Neulinger <nneul@mst.edu>
Sent: Thu, Sep 6, 2018 10:48 PM CDT
To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org>
Subject: Phone spontaneously going into Hold when a call is established?

Finally managed to get a reproducible failure on this, but don't understand SIP enough to know where it's going wrong. I have two local numbers that I can call via my local telco over a SIP trunk (MetaSwitch) - one reliably demonstrates the behavior, the other reliably works normal:

The call that is working normally (leg w/ provider):
    INVITE w/ neither sendonly nor sendrecv
    100 Trying
    183 Progress w/ a=sendrecv
    200 OK w/ a=sendrecv

The call that is going into on-hold immediately (leg w/ provider):
    INVITE w/ neither sendonly nor sendrecv
    100 Trying
    180 Ringing
    200 OK  w/ a=sendonly
    INVITE w/ a=sendrecv
    100 Trying
    200 OK w/ neither sendonly nor sendrecv

Call that goes into on hold immediately (leg w/ device):
    INVITE w/ neither, but has sdp
    407
    INVITE w/ neither, but has sdp
    100
    183 w/ neither
    200 w/ neither
    UPDATE w/ sendonly (which is after the second 200 OK above)
    200 OK w/ recvonly
    
    

I'm going to try and do some more digging on this tomorrow, but if someone has any insights here on what the proper/expected behavior is, I sure would love to hear it.

It seems like this may be somewhat related to FS-9765 - however there is no invite w/o an SDP. Also similar sounding to FS-11234. I'm happy to take this forward to provider (I'm inquiring with them as well) but would be helpful to have some more details on which piece is behaving incorrectly.

-- Nathan

-------- Original Message --------
From: Nathan Neulinger
Sent: Tue, Sep 4, 2018 2:45 PM CDT
To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org>
Subject: Phone spontaneously going into Hold when a call is established?

I had seen this symptom a few times randomly, and just got a couple of reports from users where a call to an outside
number was going immediately to 'On Hold' when the person answered.

Is there anything in the SIP/RTP stream that could be expected to trigger that sort of behavior? I've seen it from a
polycom, and I believe one of the user reports today was with a yealink. User report was with a recently upgraded 1.6 ->
1.8 deployment. I believe the previous times I've seen it would have been on git builds of 1.8, but not certain.

-- Nathan
  ------------------------------------------------------------
Nathan Neulingernneul@mst.edu
Missouri S&T Information Technology    (573) 612-1412
System Administrator - Architect 


-- 
------------------------------------------------------------
Nathan Neulinger                       nneul@mst.edu
Missouri S&T Information Technology    (573) 612-1412
System Administrator - Architect