Thank you Anthony for reply.
On production server sip trace will not help (I will get lot of debug messages) that will be difficult to analyze.
I has seen source file where message is generated and has analyse FS call log with sip messages captured by tcpdump. I think it happened when endpoint received BYE message, close RTP port and send ICMP message for new received RTP packets. When FS receive ICMP then is close channel with message in example.
I will be  verify it version and send additional info.


On Thu, May 28, 2015 at 5:44 PM, Anthony Minessale <anthony.minessale@gmail.com> wrote:
Not enough info really.

If you had the siptrace and the rest of the logs maybe it would be easier to tell.
Basically it means when it tried to write the frame it failed.  Most likely either someone was bind transferring it or FSAPI of uui_transfer was called on it.


On Thu, May 28, 2015 at 7:57 AM, Sergey Safarov <s.safarov@gmail.com> wrote:
Some calls is droped during a conversation
What is means "[DEBUG] switch_ivr_bridge.c:579 sofia/internal/1246@client-1424.rcsnet.ru ending bridge by request from write function"?

In example message at 11:01:05

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