On Sat, 8 Jun 2019, Robert Dixon wrote:

I have 2 PCs connected by  switch, and then to a router.Using IP address
calling  sip:ip address.
If I call from A to B, then A says B cannot respond to the call.
If I call from B to A, it connects for 2 seconds, then disconnects.

You need some actual information for a diagnosis.  If you don't want to
share the actual IPs, some general traits are very relevant:

IPv4?  IPv6?

Private IPs?  (192.168.*.*,172.168.*.*.*,10.*.*.*,fc00::/7, etc)

NAT?

--
              Stuart D. Gathman <[email protected]>
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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