Yeastar S100 is based on asterisk version 13, not sure if it have the same issue. I don't have a device can generate the SIP re-invite packets described in the ASTERISK-20633, so I couldn't test this in my office.
All my SIP devices send the re-invite with a=sendrecv to resume the on hold call.
Do you have any problem with these devices Broadsoft/Cisco Call Manager? If yes, could you send the SIP logs so we can report this to Yeastar team?
The problem is at one of my customers, when they call to another company and there is the call transfered, the audio is gone.
I spoke with the provider and they saw this happens.
I gonna try to make a pcap and will post it.
This happens on a S100 connected to Broadsoft.
OK, a pcap logs is welcome, so that we can check whether the issue is caused by the issue describe in the asterisk issue ASTERISK-20633
Does anyone have found a solution for this issue?
I have the same problem here based in a Broadsoft platform
Our customers have the same problem:
"The problem is when they call to another company and there is the call transfered, the audio is gone"
The customer has a Yeastar (asterisk) PBX, the another company uses Broadsoft, then this problem arises.
We solve this problem by connecting the trunk/phone number of the customer to another ITSP, the problem is gone.