Jami Between to Diffrent networks


I have few clients that sit behind Different network
one -
Second -
between them Cisco Router
if the clients work on the same LAN everything is OK , But if i try to make a call between 1.1— 2.1 the Jami can’t find a second party and cant call .
if i add in the config file the IP and port for destination network i Succeeds in making a call until the Jami is restarted
the information that i add and bootstrap _ ip of destination + dhtPort of destination.
my clients work based on windows 10 and all information dhtPort i take for Conf.yml

help to solve this issue ,