host

When hiding IP addresses in a SIP message, the SIP NAT function generates the following cookie for a SIP-URI with no userinfo portion:

[host nat tag][encrypted 13-byte host IP][encrypted 13 byte maddr IP (if present)][domain suffix]

where:

• [host nat tag] refers to the SIP NAT function’s host NAT tag.
• [encrypted 13-byte host IP] refers to the host IP encryption.
• [encrypted 13 byte maddr IP (if present)] refers to the maddr IP encryption, if it exists.
• [domain suffix] refers to the SIP NAT function’s domain suffix field.

With a SIP NAT function’s host tag of ACME- and a domain suffix of .acme.com, the following SIP header:

Via: SIP/2.0/UDP 192.168.1.100:5060

might be translated into the following:

Via: SIP/2.0/UDP ACME-pfi1s7n2pstna.acme.com