Methods and apparatus to preserve original attestation/signature information for diverted calls

A communications system comprising:

• a first Session Border Controller (SBC) including:
• memory;
• one or more Input/Output Interfaces;
• and
• a first processor, said first processor controlling the first SBC to perform the following operations:
• encrypting an original Identity header or attestation information from the original Identity header corresponding to a first call;
• placing the encrypted original Identity header or the encrypted attestation information from the original Identity header corresponding to the first call in a proprietary parameter of a Session Initiation Protocol (SIP) INVITE message;
• and
• communicating the SIP INVITE message to an endpoint device;
• and
• a second SBC including:
• memory;
• one or more Input/Output Interfaces;
• and
• a second processor, said second processor controlling the second SBC to perform the following operations:
• receiving, at the second SBC, a diverted SIP INVITE message corresponding to the first call subsequent to the first SBC communicating the SIP INVITE message to the endpoint device, said diverted SIP INVITE message not including an Identity header;
• obtaining the original Identity header or the attestation information from the original Identity header corresponding to the first call from information included in the diverted SIP INVITE message;
• and
• generating an Identity header based on the original Identity header or the attestation information from the original Identity header corresponding to the first call obtained from the information included in the diverted SIP INVITE message;
• and
• wherein said original Identity header is a SIP Identity header which includes:
• originating identity of the first call, destination information for the first call, and said attestation information;
• and
• wherein at least some of the information included in the SIP Identity header has been digitally signed or encrypted.

A non-transitory machine readable medium including first processor executable instructions and second processor executable instructions, said first processor executable instructions when executed by a processor of a first Session Border Controller (SBC) controls the first SBC to:

• encrypt an original Identity header or attestation information from the original Identity header corresponding to a first call;
• place the encrypted original Identity header or the encrypted attestation information from the original Identity header corresponding to the first call in a proprietary parameter of a Session Initiation Protocol (SIP) INVITE message;
• and
• communicate the SIP INVITE message to an endpoint device;
• and
• wherein said second processor executable instructions when executed by a processor of a second SBC controls the second SBC to:
• receive, at the second SBC, a diverted Session Initiation Protocol (SIP) SIP INVITE message corresponding to the first call subsequent to the first SBC communicating the SIP INVITE message to the endpoint device, said diverted SIP INVITE message not including an Identity header;
• obtain the original Identity header or the attestation information from the original Identity header corresponding to the first call from information included in the diverted SIP INVITE message;
• and
• generate an Identity header based on the original Identity header or the attestation information from the original identity header corresponding to the first call obtained from the information included in the diverted SIP INVITE message;
• and
• wherein said original Identity header is a SIP Identity header which includes:
• originating identity of the first call, destination information for the first call, and said attestation information;
• and
• wherein at least some of the information included in the SIP Identity header has been digitally signed or encrypted.