Hi,
Only one site is not worklin, you can see incoming call and the site can't see hea anything. Sounds like an issue with the RTP channle communication issue at the remote session.
You need to take few debugs to see what's happening:
cl db
set db size 4096
debug h323 all / debug sip all depending what you are using.
debug rm all
debug nat gate
debug flow basic with filters for the IPs involved in the communication. https://kb.juniper.net/InfoCenter/index?page=content&id=KB12208&actp=METADATA
reproduce the issue and stop the debugs by pressing ESC.
get db st
Thanks,
Vikas