Hi,

I realize very interesting problem of my software stack (FreeSwitch + Kamailio) with Yealink 41P Voip phone..

After 3-4 days research, I realize Yealink phone does not try to start RTP session if it gets UPDATE packet before ACK packet !!

In Freeswitch side, do we have a option that send UPDATE packet after RTP session is established? (we have a option in FreeSwitch side: do not send UPDATE packet however this is not good case for me, I update CallerID with this UPDATE packet)