AltiGen MAXCS 7.0 Update 1 ACM Administration - Manual (Page 433)

MAXCS connects the following application through a
firewall TCP UDP
External CDR Logger Service 10027
Remote IP Phones Behind NAT
MaxCS 7.5 Administration Manual 417
Remote IP Phones Behind NAT
For remote IP phones behind NAT, you don’t need to do any configuration. However, if the remote firewall/NAT
router blocks outgoing traffic, then you will need to open the following ports on the remote firewall/NAT router:
• UDP 10060
• UDP 30,000~31,000
• TCP 10064