Silence on B-Leg, busy tone on A-leg followed by registration fail

[Yealink_Michael]

hi

thanks for your information

for this issue , please upgrade the firmware of all phone model to the newest firmware that we released, you can download them from below link :
http://support.yealink.com/documentFront...isplayPage

just click according to different models

reset and test again

if the issue still exist , may i know the what is the rate of it ? 1 calls in 10 or 20?

please provide us the trace file for future analysis,trace file including pcap file, config bin and syslog file , and we need three of them provide at one time.

for how to get them , please refer to the FAQ below:
http://forum.yealink.com/forum/showthread.php?tid=1319

after you collect all the files , then please send them to support@yealink.com which is 24 hours work

let me know if any question

TKS & BR

Michael