i started a new thread on 491 Request Pending issue.  i made mode tests
in configuration:

ua (192.98.102.10:5074) - proxy (192.98.102.10:5060 and 5080) -
  sems sbc (192.98.102.10:5090) - sems echo server (192.98.102.13:5090).

it turned out that it is sems sbc that replies with 491 when sems echo
server sends sems sbc an in-dialog invite (session timer refresh).
immediate after 491, sems sbc sends sems echo server a bye, but ua - sems
sbc leg is not terminated.

any idea why 491 and bye are sent and why ua - sems sbc leg is not
terminated?

pcap file is enclosed.

-- juha

Attachment: 491.pcap
Description: 491 pcap

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