SSL SITE TO SITE VPN SECONDARY SITE

Hi, Question about secondary sites (UTM-9.7)
as attached in the diagram
There is a main site with a Cisco Call manger and on-site ip phones.
There are also 2 sites ip phones.
Each of them is connected in a site to site SSL VPN to a main site. Telephones can be used between the main site and the remote site (A & B), and site A to B works only ringing, no audio.
What is missing in the settings?
Thanks in advance to those who answer



SSL SITE TO SITE VPN
[edited by: Shalom Friedman at 12:33 PM (GMT -7) on 19 May 2024]