07-18-2018, 01:13 PM
Hi all,
I am facing very interesting problem about Yealink SIP-T41P series .
When SIP UPDATE packet is come before ACK (that belong to 200 OK) packet, Yealink phone does not start sending RTP packets for 36.83.0.35 firmware !!! So RTP connection is broken. However, same scenario has been tested several times with 36.80.0.130 firmware and it works well .
Same scenario has been tested with other Voip Phones also, it works for all. Only Yealink with 36.83.0.35 firmware produce errors !! In addition, these packets could come in different orders due to the network delay which is nature of computer networks !!
Note: When ACK comes before UPDATE packet, it works well
Regards,
Melek OKTAY, Ph.D.
I am facing very interesting problem about Yealink SIP-T41P series .
When SIP UPDATE packet is come before ACK (that belong to 200 OK) packet, Yealink phone does not start sending RTP packets for 36.83.0.35 firmware !!! So RTP connection is broken. However, same scenario has been tested several times with 36.80.0.130 firmware and it works well .
Same scenario has been tested with other Voip Phones also, it works for all. Only Yealink with 36.83.0.35 firmware produce errors !! In addition, these packets could come in different orders due to the network delay which is nature of computer networks !!
Note: When ACK comes before UPDATE packet, it works well
Regards,
Melek OKTAY, Ph.D.