I observe an intermittent issue in a conference where zoom server sends composite content(content and video are merged as one stream) even though Room system application negotiated BFCP and bfcp hello being responded by server.

Setup - 
1. Room System app
2. Zoom Desktop client

Scenario - Zoom desktop client joins the conference as a first participant and started sharing content in meeting. Now Room App joins the conference as a second participant.

NOTE - Composite content issue can be observed at any time - during hijacks, Zoom joined existing conference and started sharing.  

Issue - Sometime Zoom server sends composite content even though BFCP hello messages sent by Room App being acknowledged.  

INVITE from Room System App at time 12:26:42.544 - 

INVITE sip:*********** SIP/2.0
Via: SIP/2.0/TLS x.x.x.x:46094;rport;branch=z9hG4bKPjdf1ea7b5-776b-4356-9f07-a6e890c8a722;alias
Max-Forwards: 70
From: "RoomAPP" <sip:***********>;tag=1ee40a7a-460c-4be7-8324-c72fff4083f8
To: sip:***********
Contact: "RoomAPP" <sip:RoomAPP@x.x.x.x:46094;transport=TLS;ob>
Call-ID: f292268d-bd8d-4681-a296-76a90b48f6ab
CSeq: 31537 INVITE
Route: <sip:zoomcrc.com:5061;transport=tls;lr>
Content-Type: application/sdp

v=0
o=- 3898047402 3898047402 IN IP4 x.x.x.x
s=pjmedia
b=AS:3981
t=0 0
a=X-nat:0
m=audio 5000 RTP/SAVP 8 0 9 120
/* Audio SDP */
m=video 5002 RTP/SAVP 97
c=IN IP4 x.x.x.x
b=TIAS:1856000
a=rtcp:5003 IN IP4 x.x.x.x
a=sendrecv
a=rtpmap:97 H264/90000
a=fmtp:97 profile-level-id=42e01f; packetization-mode=1;max-mbps=108000;max-fs=3600;max-fps=3000
a=content:main
a=label:11
a=framerate:30.0
a=ssrc:1669027275 cname:11e6c62907144b2a
a=crypto:1 AES_256_CM_HMAC_SHA1_80 inline:RNR1qKl9b3aXaj3XtBtV46wgDiMgNyRPknSzI44Sl9w3Fsxj1M6x2+KdMvkmKQ==
a=crypto:2 AES_256_CM_HMAC_SHA1_32 inline:nOCIT27b6HwXDeeMsRtJvgg3oWTJpItvs/XmL0hvd1Fv9YnmyxiAIaGnYqULyg==
a=crypto:3 AES_CM_128_HMAC_SHA1_80 inline:ZNZU8Vu2J7yq/yEwvod6go6RH3K9kr7PLBWxtSZm
a=crypto:4 AES_CM_128_HMAC_SHA1_32 inline:5LVaU2ednEne4NpKE7kojxiLpOPsT5MfFgIunI6Q
a=rtcp-fb:* nack pli
m=video 5004 RTP/SAVP 97
c=IN IP4 x.x.x.x
b=TIAS:1856000
a=rtcp:5005 IN IP4 x.x.x.x
a=sendrecv
a=rtpmap:97 H264/90000
a=fmtp:97 profile-level-id=428028; packetization-mode=1;max-mbps=245760;max-fs=8192;max-fps=3000
a=content:slides
a=label:12
a=framerate:30.0
a=ssrc:1783907843 cname:11e6c62907144b2a
a=crypto:1 AES_256_CM_HMAC_SHA1_80 inline:m/AxRL1iOoDc9Vo/FjC/WjLqu+5JnY+BfKJXJQHiBZCpvzJFEgx44x3nNOvu0w==
a=crypto:2 AES_256_CM_HMAC_SHA1_32 inline:bj7VnUzDeB2PrrAldAdrpEhCvwvFSstXzNHNet4SNYJVjYzal9ZnVnBrfJqA/w==
a=crypto:3 AES_CM_128_HMAC_SHA1_80 inline:Qa++NTzH/U5auK8Mfk3Hr2E7+ENhnugsZBMOzkHq
a=crypto:4 AES_CM_128_HMAC_SHA1_32 inline:pZTrM7ChJjCp1wL9sf8fFedwF5xC5351dTl7B+Qv
a=rtcp-fb:* nack pli
m=application 5006 UDP/BFCP *
c=IN IP4 x.x.x.x
a=floorctrl:c-only
a=floorid:6 mstrm:12
a=connection:new
a=setup:active

200 OK received from Zoom server at time 12:26:43.519 - 

SIP/2.0 200 OK 

Via: SIP/2.0/TLS 10.5.6.63:46094;rport=13592;branch=z9hG4bKPjdf1ea7b5-776b-4356-9f07-a6e890c8a722;received=162.255.37.96;alias
Contact: <sip:xyz.abc@162.255.37.178:5061;transport=tls>;isfocus
To: <sip:***********>;tag=b7c80c05
From: "RoomAPP"<sip:***********>;tag=1ee40a7a-460c-4be7-8324-c72fff4083f8
Call-ID: f292268d-bd8d-4681-a296-76a90b48f6ab
CSeq: 31537 INVITE
Min-SE: 90
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, UPDATE, INFO, REFER, NOTIFY, OPTIONS, MESSAGE, UPDATE
Content-Type: application/sdp
Server: Room Connector Controller,Version: 2.7.100,BuildTime: 2023/05/26 07:40:03
Content-Length: 1824

v=0
o=ZoomRC 101816 101816 IN IP4 4.35.64.191
s=ZoomRC
c=IN IP4 4.35.64.191
b=AS:1920
t=0 0
m=audio 3576 RTP/SAVP 114 9 0 8 101
/* Audio SDP */
m=video 3578 RTP/SAVP 109 110 111
b=TIAS:1920000
a=rtpmap:109 H264/90000
a=fmtp:109 profile-level-id=42801f;packetization-mode=0;max-mbps=270000;max-smbps=270000;max-fps=3000
a=rtpmap:110 H264/90000
a=fmtp:110 profile-level-id=42801f;packetization-mode=1;max-mbps=270000;max-smbps=270000;max-fps=3000
a=rtpmap:111 H264/90000
a=fmtp:111 profile-level-id=64801f;packetization-mode=1;max-mbps=270000;max-smbps=270000;max-fps=3000
a=sendrecv
a=rtcp-fb:* nack pli
a=rtcp-fb:* ccm fir
a=rtcp-fb:* ccm tmmbr
a=crypto:1 AES_256_CM_HMAC_SHA1_80 inline:Onlb6Fh1TK9m9wE2hMdl2PokurMwWgpZyNLdw9enlb7ZvkTEinPcZNhcS8oO6A==|2^48
a=content:main
a=label:1
a=answer:full
m=video 3580 RTP/SAVP 109 110
b=TIAS:960000
a=rtpmap:109 H264/90000
a=fmtp:109 profile-level-id=428028;packetization-mode=0;max-mbps=216000;max-smbps=216000;max-fs=8192;max-fps=3000
a=rtpmap:110 H264/90000
a=fmtp:110 profile-level-id=648028;packetization-mode=1;max-mbps=216000;max-smbps=216000;max-fs=8192;max-fps=3000
a=sendrecv
a=rtcp-fb:* nack pli
a=rtcp-fb:* ccm fir
a=rtcp-fb:* ccm tmmbr
a=crypto:1 AES_256_CM_HMAC_SHA1_80 inline:OSKM3bVVnqbdFIiPSiLnVgNnrvPJJJIYFpfliIF3vU4tQMJY7qFi9fCu10AZiQ==|2^48
a=content:slides
a=label:2
a=answer:full
m=application 3584 UDP/BFCP *
a=floorctrl:s-only
a=confid:1
a=floorid:6 mstrm:2
a=userid:2
a=setup:passive
a=connection:new

Then ACK is sent by RoomApp at 12:26:43.610
ACK sip:xyz.abc@162.255.37.178:5061;transport=tls SIP/2.0

BFCP Hello from RoomsApp at 12:26:43.728 (not responded by server) - 
BFCP SendBFCPMessage: Primitive: eHello CommonHdr { version: 1 length: 0 confId: 1 transId: 61 userId: 2 }

Again BFCP Hello from RoomsApp at an interval of 100 ms at 12:26:43.830
BFCP SendBFCPMessage: Primitive: eHello CommonHdr { version: 1 length: 0 confId: 1 transId: 62 userId: 2 }

Again BFCP Hello from RoomsApp at an interval of 100 ms at 12:26:43.932
BFCP SendBFCPMessage: Primitive: eHello CommonHdr { version: 1 length: 0 confId: 1 transId: 63 userId: 2 }

Again BFCP Hello from RoomsApp at an interval of 100 ms  (not responded in 100 ms) at 12:26:43.830
BFCP SendBFCPMessage: Primitive: eHello CommonHdr { version: 1 length: 0 confId: 1 transId: 62 userId: 2 }

Received Fast update over SIP INFO at 12:26:44.013- 
INFO sip:BJNSIP@10.5.6.63:46094;transport=TLS;ob SIP/2.0

/* Omitting other headers */

Content-Type: application/media_control+xml
Server: Room Connector Controller,Version: 2.7.100,BuildTime: 2023/05/26 07:40:03
Content-Length: 220

<?xml version="1.0" encoding="utf-8" ?>
<media_control>
<vc_primitive>
<to_encoder>
<picture_fast_update>
<media_stream>
11</media_stream>
</picture_fast_update>
</to_encoder>
</vc_primitive>
</media_control>

SIP/2.0 200 OK from RoomApp at 12:26:44.015

Again BFCP Hello from RoomApp at an interval of 100 ms at12:26:44.034
BFCP SendBFCPMessage: Primitive: eHello CommonHdr { version: 1 length: 0 confId: 1 transId: 64 userId: 2 }

Server responded to BFCP hello messages at (12:26:44.049, 12:26:44.150, 12:26:44.253)

BFCP OnReceiveData: Primitive: eHelloAck CommonHdr { version: 1 length: 10 confId: 1 transId: 62 userId: 2 }
BFCP OnReceiveData: Primitive: eHelloAck CommonHdr { version: 1 length: 10 confId: 1 transId: 63 userId: 2 }
BFCP OnReceiveData: Primitive: eHelloAck CommonHdr { version: 1 length: 10 confId: 1 transId: 64 userId: 2 }

Bonjour,

J'utilisais Zoom via Google, et maintenant je ne peux plus me connecte il me demande de faire mise à jour et contacter l'administrateur.

Donc je me connecte via mon navigateur firefox, mais c'est compliqué, je n'arrive plus à partager mes documents qui sont google et si j'arrive à en ouvrir un je ne vois pas les invités.

Avant j'avais simplement à cliquer sur démarrer en face de ma réunion et zoom meeting s'ouvrait, maintenant cela ne fonctionne plus.

Je fais des visios tous les jours et je suis très ennuyée car ce n'est pas du tout fonctionnel pour moi, alors que ça marchait très bien avant.

Merci pour votre aide, car je perds en efficacité, en rapidité et en crédibilité.

Bien cordialement.

It's very serious what Zoom is doing with me.
My bill is paid monthly since 2020 and you are interrupting my classes in 40 minutes to force me to buy yearly plan.
I DON'T WANT IT!

Please, respect my classes.
It's an absurd and very ugly and bad for my clients.
Fabio Nemer