SIP Message-Body Separator Normalization

The Oracle® Enterprise Session Border Controller supports SIP with Multipurpose Internet Mail Extension (MIME) attachments — up to a maximum payload size of 64KB — and has the ability to allow more than the required two CRLFs between the SIP message headers and the multipart body’s first boundary. The first two CRLFs that appear in all SIP messages signify the end of the SIP header and the separation of the header and body of the message, respectively. Sometimes additional extraneous CRLFs can appear within the preamble before any text.

The Oracle® Enterprise Session Border Controller works by forwarding received SIP messages regardless of whether they contain two or more CRLFs. Although three or more CRLFs are legal, some SIP devices do not accept more than two.

The solution to ensuring all SIP devices accept messages sent from the Oracle® Enterprise Session Border Controller is to strip all CRLFs located at the beginning of the preamble before the appearance of any text, ensuring that there are no more than two CRLFs between the end of the last header and the beginning of the body within a SIP message. You enable this feature by adding the new stripPreambleCrlf option to the global SIP configuration.

To enable the stripping of CRLFs in the preamble:

1. In Superuser mode, type configure terminal and press Enter.

   ORACLE# configure terminal
   ORACLE#(configure)

2. Type session-router and press Enter to access the system-level configuration elements.

   ORACLE(configure)# session-router
   ORACLE#(session-router)

3. Type sip-config and press Enter. The system prompt changes to let you know that you can begin configuring individual parameters.

   ORACLE(session-router)# sip-config
   ORACLE(sip-config)#

4. options—Set the options parameter by typing options, a Space, the option name stripPreambleCrlf with a plus sign.

   ORACLE(sip-config)# options +stripPreambleCrlf

   If you type the option without the plus sign, you will overwrite any previously configured options. In order to append the new options to the global SIP configuration’s options list, you must prepend the new option with a plus sign as shown in the previous example.

5. Save and activate your configuration.