URL Parameter

If the SIP NAT function’s use url parameter field has a value of from-to or all, the SIP NAT function places all cookies generated to hide SIP URIs in a custom tag appended to the header. Setting the use url parameter field to:

• from-to only affects the behavior of the SIP NAT function’s cookies in the From and To headers.
• all affects all SIP headers processed by the SIP NAT function

The cookie is the following:

[;url-parameter]=[host nat tag][encrypted 13-byte host IP][encrypted 13-byte maddr IP]

where:

• [;url-parameter] refers to the SIP NAT function’s parameter name field.

  This cookie type is associated with the all and from-to field value options of the SIP NAT function’s use url parameter field.

• [host nat tag] refers to the SIP NAT function’s host NAT tag field.
• [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.

With a host NAT tag of ACME- and a parameter name of acme_param, the following SIP-URI:

sip:6175551212@192.168.1.100

might be translated into the following:

sip:6175551212@172.16.1.10;acme_param=ACME-pfi1s7n2pstna.