As far as I know,v4 does not support it.It' s a v5.0 new feature,v5.0 supports SIP over SSL.
example topo:
SIP-Server(Asterisk)
|
FGT
|
Phone1
1. Create a voip profile with enable ssl as below:
config voip profile
edit " sip"
set extended-utm-log enable
config sip
set log-violations enable
set ssl-mode full
set ssl-send-empty-frags disable
set ssl-server-certificate " Fortinet_Factory"
end
next
end
2. configure the sip port as below:
FTG_200B (vdom1) # config sys setting
FTG_200B (settings) # get
...
sip-tcp-port : 5060
sip-udp-port : 5060
sip-ssl-port : 5061
3. Create a firewall policy in which the above voip profile is enable
config firewall policy
edit 1
set srcintf " port10"
set dstintf " port9"
set srcaddr " all"
set dstaddr " all"
set action accept
set schedule " always"
set service " ALL"
set utm-status enable
set voip-profile " sip"
set profile-protocol-options " default"
set nat enable
next
end