1. Configuration Guide
  2. SIP Signaling Services
  3. SIP SIP-I Interworking
  4. SIP-SIPI IWF using Native Processing
  5. BYE and REL Interworking Support

BYE and REL Interworking Support

The SBC inserts an REL as an application/isup “content-type” with the header parameters based on the applicable sip-isup-profile, and formats the message according to the ISUP version configured in the sip-isup-profile.

If a Reason header, described in IETF RFC 6432, is included in the BYE request, the SBC maps the Cause Value of the Reason header to the ISUP Cause Value field in the REL message. If not included , the SBC inserts the following values:

  • Location—Network beyond interworking point
  • Cause Value—16 (Normal Call Clearing)

For BYEs received from the SIP-I side, the SBC inserts a Reason Header into the SIP body. This also requires that you have enabled the add-reason-header within the sip-config.