Configuration Guide Session Plug-In Language Enterprise SPLs SIP Trunking SPLs for Specific Service Providers Configure the KDDI SIP Trunk Support Option Configure the KDDI SIP Trunk Support Option You configure this SPL option on the sip-interface facing the KDDI trunk. To configure the SPL option: Access the sip-interface configuration element. ORACLE# configure terminal ORACLE(configure)# session-router ORACLE(session-router)# sip-interface ORACLE(sip-interface)# Type spl-options +Control-Surr-Reg and press Enter. ACMESYSTEM(sip-interface)# spl-options +Control-Surr-Reg Type done and save your work.