Video not visible to other participants after merging calls into conference

[savan15]

Hi

I am facing an issue while implementing video conferencing using the Linphone Android SDK.

Scenario:

There are three users (just for example might be possible more user are there.):

1. android14
2. android4
3. android45

Please see detail steps to reproduce the behavior.

Steps to reproduce:

1. android14 initiates a video call to android45

• android45 accepts the call
• Both users can see each other’s video correctly

2. During the ongoing call, android14 initiates another video call to android4

• The call with android45 is automatically put on hold (expected behavior)
• android4 accepts the call
• android14 and android4 can see each other’s video correctly

3. android14 merges both calls into a conference (video conference)

Expected behavior:

• All participants (android14, android4, android45) should:

1. See their own local video
2. See remote video streams of all other participants

Actual behavior:

• On android14:

1. Only the local video is visible
2. Remote participant videos are not displayed

On android4 and android45:

1. They are unable to see the video of android14, and other remote participant

Additional details:

• Logs have been captured and attached as a text file for debugging
• Device: MOTO G45 5G,Samsung Galaxy F15
• OS: Android 13,14
• Version of the SDK : 5.4.92

SDK logs (mandatory)

log.txt

[Viish]

Hi @savan15,

Do you reproduce this issue with our app?

[savan15]

@Viish
Yes I have also tried linphone app as well same issue.

[Viish]

@savan15,

Please test using our latest 6.2.0 beta (available on Play Store or in our snapshots) and attach logs from it if you still have it.

[agam-android7]

@Viish @savan15

It looks like I am facing the same issue.
BelledonneCommunications/linphone-sdk#565

[savan15]

@Viish
Thank you for your quick response and guidance.

Please find the requested log file attached.

Additionally, regarding your mention of version 6.2.0 beta — i am not using the beta version. The logs provided are from the application downloaded directly from the Google Play Store. I have also included a screenshot of the app for your reference.

Application log : log.txt
Application screen short with details :

[Viish]

Hi @savan15,

I'm not interested in your logs on the latest release as I've made a fix regarding the local conferencing that is not in the 6.0.23 and only in the 6.2.0-beta, hence my query.

Cheers,

[savan15]

@Viish
Ok,

I have attached the logs from the 6.2.0-beta version of the app. I would also like to mention that there is no video during the call.

Additionally, we are using our own custom VoIP/SIP server.

Application log : log.txt

Application screen short with details :

[savan15]

@Viish
Do you need any additional details from my side?

[Viish]

Hi @savan15,

I don't see anything wrong in the apps logs.
There are a few logs from our SDK that would indicate an interop issue with your conference server.
What conference server software are you using?

2026-03-30 13:08:53:845 [org.linphone/liblinphone] WARNING No stream with a main stream content attribute has been found; nonetheless the media description has at least one stream active video stream and none with content thumbnail and direction recvonly. It means that the remote party is likely to be on a Grid layout and is not wishing to send its camera's video stream
2026-03-30 13:08:53:845 [org.linphone/liblinphone] WARNING No stream with a main stream content attribute has been found; nonetheless the media description has at least one stream active video stream and none with content thumbnail and direction recvonly. It means that the remote party is likely to be on a Grid layout and is not wishing to send its camera's video stream
2026-03-30 13:08:53:845 [org.linphone/liblinphone] WARNING No stream with a main stream content attribute has been found; nonetheless the media description has at least one stream active video stream and none with content thumbnail and direction recvonly. It means that the remote party is likely to be on a Grid layout and is not wishing to send its camera's video stream
2026-03-30 13:08:53:845 [org.linphone/liblinphone] WARNING No stream with a main stream content attribute has been found; nonetheless the media description has at least one stream active video stream and none with content thumbnail and direction recvonly. It means that the remote party is likely to be on a Grid layout and is not wishing to send its camera's video stream
[...]
2026-03-30 13:09:18:113 [org.linphone/liblinphone] MESSAGE It seems that we are dealing with a legacy conference server that doesn't provide device's thumbnail informations for Conference [0xb40000715a952590] (<sip:conference-focus@abc.com;gr=cbe98f67-8dba-42f5-a957-40aff171b70d;conf-id=k7BUasuu6>).

Anyway there's nothing to be done at our app level, maybe this could be fixed in our SDK but we would need your conference server logs as well.

Cheers,

[savan15]

@Viish

What conference server software are you using?

We are using the Flexisip server as our conference server.(voip/sip server)

[krunal-del]

@Viish ,

On the Flexisip server side, we are seeing the following log:
liblinphone-message- No match for H265/90000.

Additionally, video calling is working properly on iOS for both conference and SIP-to-SIP calls. However, on Android, we are facing an issue where video is not enabled during conference calls.

[Viish]

@savan15 @krunal-del please add logs from your flexisip as well so we can take a look at what happens.

[Viish]

Any update?

[savan15]

@Viish
Yes, sorry for the late reply. I’ve been traveling for the past few days, so I wasn’t able to check your response.

I’ve just reached home—let me provide it now.

flexisip-proxy+presence+conference.log