Headers

Last Updated : Jun 23, 2023 |

  • Accept

  • Alert-Info

  • Allow

  • Allow-Event

  • Authorization

  • Call-ID

  • Contact

  • Content-Length

  • Content-Type

  • CSeq

  • Diversion

  • From

  • History-Info

  • Max-Forwards

  • P-Asserted-Identity

  • P-Early-Media

  • P-Preferred-Identity

  • Privacy

  • Proxy-Authenticate

  • Proxy-Authorization

  • Proxy-Require

  • Require

  • Remote-Party-ID

  • Server

  • Session-Timers

  • Supported

  • To

  • User-Agent

  • Via

  • WWW-Authenticate

Additional Information

  • The IP Office supports Call-ID headers of up to 256 characters.

  • For IP Office R11.1 FP2 SP3 and higher, the maximum length of the tag element in From and To headers has increased to 150 characters (previously 80 characters).

Related information
IP Office SIP trunk specifications