[asterisk-users] Maximum retries exceeded on transmission

[AJ Grinnell]

I have searched this list and others, and see other pepole having this
issue. However, I have not seen how to fix it.

Sep 12 18:52:36 *WARNING*[4620]: *chan_sip.c*:*1835 retrans_pkt*: Maximum
retries exceeded on transmission
778f89593967725f0abe40eb1752504c at 10.10.206.53 for seqno 1620 (Critical
Response)

Sep 12 18:52:36 *WARNING*[4620]: *chan_sip.c*:*1835 retrans_pkt*: Hanging up
call 778f89593967725f0abe40eb1752504c at 10.10.206.53 no reply to our critical
packet.

What is the critical packet that is not being responded to? Please help.
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