95
Appendix B
Firewalls and NAT
Chapter contents
Working with Firewalls and NAT
.........................................................................................................................96
Configure the firewall
............................................................................................................................................96
Recording the external IP address
....................................................................................................................96
Opening VoIP ports
.......................................................................................................................................96
Configure a Phone
.................................................................................................................................................97
Identifying the external IP address
..................................................................................................................97
PHONESET_EXTERNAL_IP_ADDRESS
.............................................................................................97
Setting the SIP port
...................................................................................................................................97
Setting the RTP/RTCP ports
....................................................................................................................97
Work with a Firewall with NAT
............................................................................................................................98
Work with a Proxy Firewall
...................................................................................................................................99
Configuring phones for a SIP firewall proxy
....................................................................................................99
Using HTTP proxy settings
............................................................................................................................99